Crop rotation regularly changes the crop in each field, soil preparation practices, subsequent soil tillage, and weed control techniques. This category includes plants particularly obnoxious to people, such as poison ivy and poison oak, both of which cause itching and swelling when people come into contact with them. Spurred anoda also has two heart-shaped cotyledons like prickly and arrowleaf sida, however, the first true leaf of spurred anoda is not as coarsely toothed as that of prickly or arrowleaf sida. Some weeds are almost exclusively identified with rangeland, a dry, untilled, extensive environment. Velvetleaf, (Abutilon theophrasti), annual hairy plant of the mallow family (Malvaceae) native to southern Asia. Only the worst farmer or horticulturalist would attempt to grow a crop in an environment in which these weeds thrive. Gómez et al. 23 % at 5 plant/m2 aeschynomene enabled the effective use of both pesticide groups (Klerk et al., 1985). If seed germinates on the soil surface, it dies. Yerkes et al. Colletotrichum coccodes (Wallr). Drawn from such data sets is the first principle guiding weed management: Reduce weed density. Although it is essential to know the crop and whether it is agronomic or horticultural, it is not particularly useful. Annual grass weeds can be reduced in small grain crops by growing corn in the rotation and using herbicides selective in corn plus cultivation to control the grasses when corn is grown. Poultice of the leaves is applied to ulcers. Made popular in recent years as a remedy to prevent and treat common cold and flu, this shrubby tree has been prized for its medicinal properties for many centuries. Abutilon Theophrasti is a good herbal treatment with the Ophthalmic attribute. Effect of Preceding Crop on Number of Weeds That Germinated in 400-g Sample of Soil After 3 years of Each Sequence (Dotzenko et al.,1969). Free-floating plants (e.g., water hyacinth) attract attention because their often massive infestations are so obvious. Suitable for: light (sandy), medium (loamy) and heavy (clay) soils and prefers well-drained soil. Westerman et al. Cultivation of the soil may seem like a good solution, but it only brings seeds to the surface where they are able to germinate readily. Surface tension is a more important determinant of the tendency to spread than it is of stomatal entry. (1996) studied the interaction between temperature and CO2 on rice–barnyardgrass (E. cruss-galli) competition and reported that elevated CO2 favored the crop at day/night temperatures of 27/21°C but favored the growth of barnyardgrass at 37/29°C. While not terribly difficult to control in a normal corn and soybean rotation when utilizing proper rates of herbicides, there are a few special management options to consider when trying to control velvetleaf in your field. Crop cultivation, land preparation time and method, and time of planting and harvest will favor some weeds and discourage others. Rotations affect weed populations and management requirements. Ball, S.D. Lines are fitted nonlinear regression curves for each emergence date. Therefore, leaving seed lying on the soil surface reduces survival. Not many studies have been performed to evaluate the interactive effects of drought and increased CO2 levels on crop–weed competition. Triazine resistance based on enhanced herbicide metabolism has been documented in at least two weed species, velvetleaf and rigid ryegrass. Sugar beets grown after beans in Colorado were always more weed-free than sugar beets grown after sugar beets, barley, or corn (Dotzenko et al., 1969). Velvetleaf is an erect, summer annual that is easily identifiable by the heart-shaped leaves and soft hairs, which cover the weed. Beans are cultivated frequently and intensive chemical weed control is practiced. Table 10.17. Wisconsin Master Gardener states:. Velvetleaf is in the Waikato region. The effects of elevated CO2 on crop–weed competition are also influenced by temperature. Winter wheat (Triticum aestivum L.) seed yield (a) and downy brome (Bromus tectorum L.) shoot biomass (b) as functions of downy brome density and times of emergence relative to wheat. However, DeMol et al. Wild oat is common in irrigated wheat and barley but rarely in rice. Also, five times less inoculum was needed to control sicklepod when applied with glyphosate than without the herbicide, without affecting its specificity. Elevated CO2 may have varying implications on nutrient dynamics between crops and weeds. Water is not compatible with many plant surfaces, especially those with thick or very waxy cuticles. Ball and Miller (1990) showed that weed composition varied with cropping sequence among rotations of corn for 3 years, pinto beans for 3 years, or 2 years of sugar beets followed by 1 year of corn (Fig. Velvetleaf, a summer annual broadleaf plant, is a problematic weed for many crops in the United States, particularly where cotton, corn, or soybeans are major crops. Various parts of this plant are used for medicinal purposes like stems and leaves of Cissampelos pareira are used for Gastro-Intestinal disorders such as diarrhea, dysentery, ulcers, intestinal worms, and other digestive complaints. Alberto et al. In a few cases, resistance in weeds has been reported to be due to more rapid detoxification of the triazine herbicide (Andersen and Gronwald, 1987; Andersen, 1988). Initial seed density was highest with no-tillage and declined as tillage intensity increased. Associations can be changed by rotating crops, altering time of planting, or changing weed control methods. Atrazine-resistant jimsonweed was cross-resistant to simazine, but was susceptible to prometryn, metribuzin, terbacil, and other herbicides. However, integration of red clover in a sweet corn–pea–wheat rotation led to a 96% reduction in seed bank density of winter annuals. TIP: Wear garden gloves to protect your hands. Reproduced with permission of Weed Sci. mean they will respond more favorably to higher CO2 levels than the C4 weeds (palmer amaranth (A. palmeri), waterhemp (Amaranthus rudis), kochia (K. scoparia), etc.) http://res2.agr.ca/Lethbridge/weedbio/index_e.htm#toc, http://www.plant.uoguelph.ca/resistant-weeds/. Flowers from late July until Autumn. Emersed aquatic weeds (e.g., common cattail) grow with their root system anchored in bottom mud and have leaves and stems that float on water or stand above it. 4 % at 1 plant/m2 Often stomata are not open during the day when herbicides are most commonly applied; they close during the heat of day and open during cool mornings and evenings. The mechanism of chlorotoluron resistance was Cyt P450-based enhanced oxidative metabolism through N-demethylation and ring-methyl hydroxylation (Moss and Cussans, 1991). It is possible, but not very likely, for a droplet of a liquid with high surface tension to bridge a stomatal opening and not enter it. Crop rotation has significant effects on the soil seed bank. Combining biological and identifying characteristics of top interfering species along with new emerging research articles, media, and control options, weedinfo.ca provides the tools to make informed risk-reducing weed control decisions. A promising consideration concerning possible chemical interactions with plant pathogens is the utilization of various chemicals, including herbicides, to increase the effectiveness of biological agents by weakening host resistance to infection by a pathogen (Charudattan, 1993). Modern research has tended to support many of these traditional uses ... Ethanolic rhizome extracts have shown antihistaminic, hypotensive, antispasmodic and anticonvulsant properties[299. Velvet leaf plant is a well-known healer of joints that are achy and swollen, thanks to its analgesic and anti-inflammatory properties. Brainard et al. When sunflower was a summer crop or a 12-month fallow was included in the rotation to prevent new seed production, the soil seed reserve declined 57%–80% annually. 1-Aminobenzotriazole, an inhibitor of Cyt P450 monooxygenases, reduced the rate of N-dealkylation in both of the resistant biotypes and enhanced simazine toxicity, indicating that the resistance was mediated by elevated Cyt P450 activity (Burnet et al., 1993). It is also used in the treatment of chronic skin diseases and in the treatment of poisonous bites. David O. TeBeest, in Advances in Agronomy, 1996. (Elmore and Paul, 1983). They move with wind and floods and some have stopped river or lake navigation. Amit Shukla, Malcolm D. Devine, in The Triazine Herbicides, 2008. The fruit from each flower is a circular cluster of 12 to 15 seedpods about 1 - 2.5 cm long (B) at first green but turning dark brown to black at maturity. Population reduction is accomplished by competition or through use of different weed control techniques in different crops. Aruna Varanasi, ... Mithila Jugulam, in Advances in Agronomy, 2016. It can be seen in Fig. It is an Unwanted Organism under the Biosecurity Act, and as such, entry to New Zealand is prohibited. Ziska (2003) studied the effect of elevated CO2 concentration on interactions of the dwarf sorghum (C4) with and without the presence of a C3 weed (velvetleaf; Abutilon theophrasti) and a C4 weed (redroot pigweed; Amaranthus retroflexus). Results of experiments with a variety of weedcrop combinations, including wild oat (Avenafatua L.) with barley (Hordeum vulgare L.) and wheat (Triticum aestivum L.) (Cousens et al., 1987), nightshade (Solanum spp.) The stems are terete (circular in cross-section), and pubescent. Although the fungus infected velvetleaf over a wide range of dew period durations and temperatures, disease was most rapid and destructive at 24 °C following a 24-hr dew period. The leaves of the sumac plant may be steeped to make a tea used to treat fever. After 18 years, no-tillage had larger seed banks than moldboard and chisel plowing, crop rotation, and cereal monoculture, which the authors concluded confirmed the importance of annual seed production (seed rain) and seed bank management on the sustainability and success of no-tillage systems. Weed–crop associations are not accidental and can be explained. 1971; Gressel et al., 1982, 1983). Beans, on the other hand, are planted in late spring and tillage can be used to destroy most summer annual weeds. Redroot pigweed, velvetleaf, Canada thistle, and quack grass are commonly associated with agricultural crops. Agriculture is a highly complicated enterprise in which all effects may never be precisely defined. Cissampelos Pareira Medicinal Uses Patha is used in the treatment of chronic non-healing ulcers and sinuses. Amit Shukla, Malcolm D. Devine, in The Triazine Herbicides, 2008. The few studies that have been done show that the effects of crop rotation on weed biomass and yield are minor compared with the effects of weed management in the crop. Velvetleaf, crabgrass, and some species of mallow have hairy leaf surfaces that prevent direct, quick contact of spray droplets with the leaf surface. advocated continued study of weed seed bank dynamics in different cropping systems because of the potential for determining weed management strategy. The enhanced conjugation was found to be due to the overexpression of two GST isozymes, not due to increased glutathione content. postulate that diversified cropping systems are likely to have high soil microbial biomass and therefore strong potential to increase the rate of seed decay. Ball and Miller attributed the differences to the herbicides used in each cropping sequence. *assumes that the weed has emerged with the crop and has been left uncontrolled all season. AMARE, redroot pigweed; CHEAL, common lamb's-quarters; CN, 3 years' corn; ERACN, stink grass; KCHSC, kochia; PB, 3 years' pinto beans; SB, 2 years' sugar beets plus 1 year of corn; SETVI, green foxtail; SOLSA, hairy nightshade. Tea made from the dried leaves is used in the treatment of dysentery and fevers. It is hardy to zone (UK) 4. This is especially true with some of the monocot or grass weeds that are already partially inherently resistant to atrazine (Thompson et al. The witch weed emerged above the ground and flowered earlier under the lower CO2 concentration. The first and most important agricultural, weedy habitat is crop land, where many annual and perennial weeds grow with disturbing regularity. Their work showed that in a 4-year corn–soybean–oat/alfalfa–alfalfa cropping system versus a conventional corn soybean rotation, giant foxtail seed decay was consistently greater at 2- versus 20-cm depth and was higher in the more diverse rotation. (1990, 1991) showed that the inoculum thresholds needed to control C. obtusifolia and Datura stramonium L. with A. cassiae and Alternaria crassa (Sacc.) However, in other places (e.g., a windbreak, an ornamental) each of these tree species could be desirable. Heggenstaller and Liebman (2006) similarly found that corn–soybean rotations that included alfalfa and triticale “facilitated” velvetleaf suppression and reduced herbicide use. Enhanced herbicide metabolism plays a major role in conferring resistance in only a few weed biotypes. There was a great reduction in the size of the soil seed bank of winter wild oats when the cropping program was other than continuous winter cereals (Fernandez-Quintanilla et al., 1984). It is logical to assume that crop rotation will affect weed density, species, and management techniques. The Cherokee nation used a decoction made from sumac bark as a remedy for a sore throat. There are poisonous weeds such as locoweed and larkspur on rangeland and many others including thistles (of several species), dandelion, groundsel, buttercup, and vetch, but these also occur in other places. A biotype (WLR2) of rigid ryegrass was identified in western Australia that was resistant (3- to 9-fold) to chloro-s-triazines, methylthio-s-triazines, substituted ureas and triazinone herbicides (Burnet et al., 1991). Thus, climate change could influence the outcomes of crop–weed competition in different ways, which further necessitates specific weed management strategies that are more flexible and adaptable to future climate scenarios. Upper part of flowering stem. They suggested that effects of these rotations over long periods would be of greater significance. Water, a finite resource, has been and will continue to be essential for urban and agricultural development. They asked whether “many little hammers” were more than or equally as effective as intensive herbicide weed management. When one crop is grown in the same field for many years (monoculture), some weeds, if they are present in the seed bank or simply arrive, will be favored and their populations will increase. 1, variation among years in the yield loss-weed density relationship was attributed to differences in the timing and quantity of rainfall (Blackshaw, 1993a). Each can occur in many different crops and environments. A.Ozzie Abaye, in Common Grasses, Legumes and Forbs of the Eastern United States, 2019. Velvetleaf in crops. Bio‑herbicidal effects of five essential oils on seed germination and early seedling growth of velvetleaf (Abutilon theophrasti Medik.) In 2016 velvetleaf seed was accidently imported with fodder beet seed and planted on over 600 properties throughout most of NZ. It is in leaf from May to October, in flower from July to August. http://www.plant.uoguelph.ca/resistant-weeds/. Rising atmospheric CO2 concentration altered the competition between rice and barnyardgrass in favor of rice (Zeng et al., 2011). This biotype was resistant to both atrazine and simazine but not to other PS II inhibitors (Gronwald, 1994). Cultivation alone resulted in yield losses in sweet corn (30%) and cabbage (up to 7%), but not in snap beans compared with either half or a full rate of the appropriate herbicide. Gray et al. Instructions. This is the same mechanism responsible for the corn and sorghum tolerance to atrazine. (2013) reported the interactive effects of CO2 levels (400 and 800 μmol mol−1) and temperatures (21/12°C and 26/18°C day/night) on tomato plants grown in competition with and without two common weeds, lambsquarters (C3) and redroot pigweed (C4). (2013) postulate that diversified cropping systems are likely to have high soil microbial biomass and therefore strong potential to increase the rate of seed decay. (2008) showed that changes in weed seed bank density and composition associated with different commonly used crop rotations over a 3-year period had relatively little effect on weed management and crop yields in field crops. From there Abutilon theophrasti made its way nearly everywhere on earth. Diverse, longer rotations with “more phenologically” diverse crops can reduce the soil weed seed bank population of annual broad-leaf weeds. You can use most of the plant, including the root. The leaf used to be eaten as a vegetable. It was also prescribed for diarrhea. Most of the world's major cities are located on a lake, ocean coast, or major river. Because leaves are one of the principal entry points for herbicides, their structure and function are important. It is incorrect to assume that plants with thick, waxy cuticles absorb less herbicide or absorb the same amount more slowly than plants with thin cuticles. It has been suggested that it may be of value in the treatment of ciguatera poisoning contracted from the consumption of reef fish. Currently None Available for this weed. In 1600, forests covered 46% of the United States (1023 million ac). The level and pattern of resistance to various herbicides in these biotypes depend, presumably, on the activity and specificity of the enzyme(s) responsible for the enhanced herbicide metabolism. It was introduced […] A concern with the use of C. gloeosporioides f.sp. In many places, barley is planted in spring before soil temperatures are ideal for germination of most annual weeds. Increased CO2 was not associated with a significant increase in redroot pigweed biomass. A good rotation includes crops that reduce the population and/or deter growth of weeds that are especially troublesome in succeeding crops. Stomata appear to be obvious entry points, but most herbicides enter plants through leaf surfaces. However, prickly and arrowleaf sida have two heart-shaped cotyledons unlike the round and heart-shaped cotyledons of velvetleaf. (1996) have reported enhanced metabolism-based (increased GSH conjugation) resistance to atrazine in two of these biotypes of velvetleaf from Wisconsin and Maryland. Cluster of seedpods. Homer M. LeBaron, in The Triazine Herbicides, 2008. 38 (1990) 522–527. – Leaves and roots used for treatment of ulcers. Another problem with entry through stomatal openings is the surface tension of spray solutions. Each individual pod (a) opening with a vertical slit down its back and containing several purplish-brown "V-shaped" seeds about 1mm thick and 2-3 mm long. Since climate change imposes new limitations on resources essential to plant growth, crop–weed interactions and crop losses from weeds are likely to be affected. Typical yield loss relationships are shown in Fig. In yet another unique approach to increase the effectiveness of biological pesticides by aiding the establishment of infections in the abscence of conducive environmental conditions, Boyette et al. Crop rotation is done for economic, market, and agronomic reasons. Herbicide molecules are more likely to contact and remain on the broad leaves of dicots than on grass leaves, which are usually disposed perpendicular to the soil surface. DePrado et al. Alternate (1 per node), broadly heart shaped, large, 7-10 cm wide with a sharp-pointed apex, shallowly round-toothed, soft-hairy and velvety to the touch. It is not a precise way to classify because there is so much overlap among crops. Velvetleaf plants at all growth stages were susceptible and were reduced in vigor following inoculations, but only plants at the cotyledonary stage were killed (Wymore et al., 1988). Its anti-inflammatory activity has been investigated with encouraging results. But when a hairy surface becomes saturated, herbicide entry may be promoted because hairiness delays evaporation. This technique offers an intriguing approach to enhance the pathogenic effects of many pathogens and, therefore, also to increase their potential effectiveness as microbial pesticides. Relationships between crop yield and weed density often vary considerably among environments and years, coincident with variation in temperature conditions, moisture availability, fertility source, and other factors (Aldrich, 1987; Mortensen and Coble, 1989; Bauer et al, 1991; Liebman and Ohno, 1997; Lindquist et al., 1996). Others such as crabgrass, common mallow, prostrate knotweed, dandelion, and creeping wood sorrel commonly associate with horticultural crops. For example, integration of red clover in continuous field corn in a field with a growing seed bank led to greater emergence of summer annual weeds compared with field corn alone. Submersed plants (e.g., hydrilla) complete their life cycle beneath the water. They can interfere with navigation, recreation, and power generation. Therefore, a broader understanding of the potential interactions between crops and weeds in the context of climate change, particularly CO2, high temperature, and drought, is essential to evaluate the vulnerability of crop production at various regions of the world (Valerio et al., 2013). Stomata vary in number, location, and size among different plant species, and while they can be located on upper and lower surfaces, most agricultural plants have the majority of stomata on lower surfaces. The relative dry weight of weeds in four cropping systems in the Philippines is shown in Table 10.17. Velvetleaf: A. Keeping stock out of velvetleaf-infested paddocks is the best possible action to avoid spreading this weed. The number of weeds was highest when corn preceded sugar beets and lowest when beans preceded. Elevated CO2 levels could affect the growth rates of crops and weeds by altering worldwide temperature, precipitation, and radiation patterns. In addition to common herbaceous annual and perennial weeds, there are others unique to the forest environment (Table 3.3). Arch … Combining biological and identifying characteristics of top interfering species along with new emerging research articles, media, and control options, weedinfo.ca provides the tools to make informed risk-reducing weed control decisions. Evidence suggests that broadleaf C3 weeds are preferentially selected at elevated CO2 levels (Ziska and Goins, 2006). Increased CO2 levels will directly affect photosynthetic activity and crops’ ability to compete with surrounding weed species, which could modify weed distribution patterns (Chandrasena, 2009). Matt Liebman, Eric R. Gallandt, in Ecology in Agriculture, 1997. Velvetleaf (Abutilon theophrasti Medik. It helps in curing Eye related ailments like Cataract. From D.A. For the experiments shown in Fig. The alternate leaves are up to 8" long and across (excluding the petioles). Perhaps they never will be, because climate, crop, soil, management skill, etc., are all involved. Increasing CO2 levels can favor either the crop or the weed in the same field. Velvetleaf soldierbush's Behavior & Ecology An atrazine-resistant biotype of velvetleaf identified in Maryland in 1984 was 10-fold more resistant to atrazine than the susceptible biotype (Ritter, 1986; Gronwald et al., 1989). This can be overcome by tank-mixing ammonium sulfate at 8.5-17 lbs. Commonly, the plant is consumed by mouth for joint healing from within. However, invert emulsions also have the potential for crop damage, and the significance of potential crop damage by mycoherbicides in invert emulsions is not clear (Amsellem, 1991). ScienceDirect ® is a registered trademark of Elsevier B.V. ScienceDirect ® is a registered trademark of Elsevier B.V. URL: https://www.sciencedirect.com/science/article/pii/B9780128139516000030, URL: https://www.sciencedirect.com/science/article/pii/B978044451167650012X, URL: https://www.sciencedirect.com/science/article/pii/B9780444511676500131, URL: https://www.sciencedirect.com/science/article/pii/S0065211308601807, URL: https://www.sciencedirect.com/science/article/pii/B978012804549700007X, URL: https://www.sciencedirect.com/science/article/pii/S0065211315001297, URL: https://www.sciencedirect.com/science/article/pii/B9780123782601500105, URL: https://www.sciencedirect.com/science/article/pii/B978012811143700010X, URL: https://www.sciencedirect.com/science/article/pii/B9780128111437000147, URL: https://www.sciencedirect.com/science/article/pii/B9780128111437000032, Common Grasses, Legumes and Forbs of the Eastern United States, Basis of Crop Selectivity and Weed Resistance to Triazine Herbicides. Tank mix applications of C. coccodes and thidiazuron (N-phenyl-N′-l,2,3-thidiazol-5-yl-urea) acted synergistically to increase velvetleaf mortality when compared with the fungus alone (Wymore et al., 1987; Hodgson et al., 1988). This can be overcome by tank-mixing ammonium sulfate at 8.5-17 lbs. – Leaves used for scabies. With spring barley, the soil seed bank declined 10%/year. Ministry for Primary Industries (MPI) Director of Investigations, Diagnostics and Response, Veronica Herrera, says the operation has involved a large number of people including volunteers. Abutilon theophrasti is a ANNUAL growing to 1 m (3ft 3in). (1993) and Egley et al. “Total seedbank density generally increased as tillage was reduced” (Légère et al., 2011). Long-term studies to determine the effect of different cropping sequences on the population dynamics of winter wild oat (Fernandez-Quintanilla et al., 1984) showed that continuous winter cereal cropping (with or without herbicides) increased the winter wild oat soil seed bank from 26% to 80%/year. At elevated CO2 concentrations, relative yield and competitive ability of C3 plants, soybean and lambsquarters were significantly higher than that of C4 plants, millet and pigweed (Miri et al., 2012). Sharon et al. Medicinal Purposes of Mullein. Figure 1. A fibrous root system with a shallow taproot. Velvetleaf Abutilon theophrasti Mallow family (Mallow family) Description: This plant is a summer annual about 2-7' tall that branches occasionally. Abutilon Theophrasti is a herbal treatment for Fever and Diarrhea. Woody perennials such as alder, aspen, big-leaf maple, chokecherry, cottonwood, oaks, and sumac and the herbaceous perennial bracken fern (common in the acidic soils of Pacific Northwest Douglas fir forests) are unique forest weeds. Aquatic weeds (Table 3.3) interfere with crop growth because they impede water flow or use water before it arrives in cropped fields. A 10-year study in Winnipeg, Canada showed that standard (crop rotation and herbicides) weed management practices reduced weed populations below yield-loss thresholds (Gulden et al., 2011). In controlled experiments in a greenhouse or growth chambers, barnyardgrass seedlings could be controlled with the fungus after treatment with a sublethal dose of atrazine. J Ethnopharmacol 2002;82:117-25. Red alder has been the target of biological control with a fungus (Dorworth, 1995). We use cookies to help provide and enhance our service and tailor content and ads. Velvetleaf has been found in 11 regions on 215 properties associated with fodder beet to date. Consequently, it is likely that resistance to triazines in this blackgrass biotype is also due to enhanced herbicide detoxification. Zgorniak-Nowosielska I, Grzybek J, Manolova N, et al. (2005) compared effects of a corn–soybean rotation with a corn–soybean–triticale–alfalfa–alfalfa rotation on the population dynamics of velvetleaf. Velvetleaf seed decayed little in comparison. Table 10.16. with corn (Lindquist et al., 1996), indicate that the relationship between crop yield loss and weed density often conforms to a rectangular hyperbola (Aldrich, 1987). (1995a) reported that triazine-resistant velvetleaf biotypes from Wisconsin and Maryland were about 100-fold more resistant to atrazine and simazine than the normal triazine-susceptible accession, but there was no cross-resistance or negative cross-resistance to other herbicides, including ametryn, cyanazine, metribuzin, and terbacil.

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