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Showing 1 to 20 of 133 for “"yield loss"”.
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Yield Loss Studies With Anthracnose Stalk Rot of Corn
… or Diplodia maydis to estimate potential yield loss. Experiments were done from 1978-1980 with a second location and D. maydis inoculations added in 1979 and 1980. Treatments were compared to a water injected control, as an inoculation wound effect occurred. Losses from C. graminicola …
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Powdery Mildew of Soybeans: Epidemiology, Disease Reactions, and Yield Loss
Made available in DSpace on 2014-12-14T04:37:44Z (GMT). No. of bitstreams: 1 7913548.pdf: 2193410 bytes, checksum: 73baa8a45374ab01b05c11d4999e9cdc (MD5) Previous issue date: 1978
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Variable weather and implications for herbicide efficacy and yield loss due to weeds
… crop management, and weed control on yield and yield loss due to weeds were examined for corn in Chapter 3 and soybean in Chapter 4. Late-season weed control was found to be the largest contributor to yield and yield loss in corn and soybean. Furthermore, inadequate water availability …
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Gray leaf spot of corn: yield loss and evaluation of germplasm for resistance
… continuous corn practices. This disease can be yield limiting. Corn hybrids were evaluated under natural disease pressure for three years (1989, 90, and 91) at two locations (Montgomery and Wythe Co., VA). Yield losses ranged from 2127.4 kg/ha (Wythe Co., 1991) to 4242.2 kg/ha (Wythe Co., 1990). …
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Epidemiology, Yield-Loss Prediction, and Control of Cercospora Leaf Spot of Cowpea (Vigna Unguiculata)
Made available in DSpace on 2014-12-10T23:32:48Z (GMT). No. of bitstreams: 1 7405687.pdf: 2068387 bytes, checksum: f1bc246241e6e5dc430078bce1c5fcb7 (MD5) Previous issue date: 1973
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Weed-soybean canopy apportionment as an estimation of soybean (Glycine max) development and yield loss
… of weed measurements in predicting the yield losses of soybeans growing next to jimsonweed (Datura stramonium) and common cocklebur (Xanthium strumarium). Dates of soybean planting, locations, weed species, and years, were varied to evaluate the impact of environment on weed-crop …
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Maize Dwarf Mosaic Virus in Zea Mays L.: Inheritance of Resistance, Yield Loss, Serology, and Seed Transmission
The effect on sweet corn yield of inoculation with maize dwarf mosaic virus (MDMV) at the three-leaf, eight-leaf, or just prior to silking was examined. Early infection delayed maturity, reduced yield and plant height. Little difference was found between the late inoculation and the inoculated …
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Yield Loss Models for Foliar Diseases of Alfalfa and Evaluation of Chemical and Cultural Disease Control Methods
… relating various measures of disease level to yield were developed for the complex of fungi which cause foliar disease on alfalfa (Medicago sativa). The accuracy and precision of the models was evaluated using data other than those from which the models were constructed. Linear models using …
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Infestation Patterns of the Coconut Mite, Eriophyes guerreronis (Keifer) (Acari: Eriophyidae), on Coconuts and Resulting Yield Loss in Eastern Jamaica
… of the nut surface, size reduction and copra yield. It was found that coconut mite populations were the same in the two rainfall zones but differed between Maypan and Red Malayan Dwarf varieties. More Maypan nuts were infested with coconut mites than Red Malayan Dwarf nuts. More 2-month old …
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Evaluation of Rice Stink Bug, Oebalus pugnax (F.), Damage and Monitoring Techniques in Rice, Oryza sativa L., and Grain Sorghum, Sorghum bicolor (L.)
… sweep net samples of 1.8m to direct and indirect yield loss by the rice stink bug. Peck levels and total milled rice were affected by rice stink bug density, whereas data on total head rice and direct yield loss were less clear. These results confirm the validity of the current Arkansas indirect …
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Yield response of soybean to planting date and row spacing in Illinois
… evaluated. Planting date had a large effect on yield and the northern locations experienced progressive yield loss with delayed planting. At the northern locations from April 19th to May 24th yield loss per day more than doubled from 10.9 to 24.9 kg/ha/day. At southern sites with poorer soils …
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Corn yield following a delayed application of nitrogen
… is considered a way to increase N uptake and yield and to limit N losses, but the length of the delay may increase the risk of yield loss. We conducted a 3-year experiment at Urbana, Illinois in which half of the N (112 kg N ha-1) was injected as UAN at planting and the other half or all (224 …
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INNOVATION IN YIELD IMPROVEMENT
… 2008 to December 2008. Methodology to solve low yield problems was presented. Then, innovative step-by-step methods for yield improvement for both systematic and "unknown" failures were evaluated. SWLY and SLLY were employed to enhance the yield for systematic failures. For "unknown" yield loss, …
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Automated soybean cyst nematode extraction unit
… estimated $0.7-1.2 billion reduction in annual yield loss. In order to manage yield loss due to SCN, soybean producers employ a nematode management plan which utilize extensive soil sampling to assess SCN population density. Even though the nematode management practices exist, they require …
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Interaction Between Weeds and Insect Pests With Snap Beans (Phaseolus Vulgaris L.)
… model for both relative leaf area and snap yield loss. The yield losses were dependent on the year and emergence time. Maximum yield losses at 8-weeds/m row ranged from 29 to 53% in snap bean plots with redroot pigweed, and 46 to 50% in plots with crabgrass. In crabgrass plots, coefficient A …
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Responses of rotation-resistant and rotation-susceptible populations of the western corn rootworm to transgenic corn expressing cry toxins and validation of a damage function for corn rootworm larvae
… a significant insect pest of corn, Zea mays L. Yield losses and control costs associated with the corn rootworm complex—which includes the northern (Diabrotica barberi Smith & Lawrence) and southern (Diabrotica undecimpunctata howardi Barber) corn rootworms as well—exceed an estimated $1 billion …
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Characterization of Coleus x hybridus Voss. 'Goldbound' water requirements
… major factor limiting global crop productivity. Yield loss caused by water stress is estimated to exceed total loss from all other causes. Moreover, availability of agricultural water is declining worldwide because of increasing demand and decreasing quality. Consequently, knowledge of plant …
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Assessing the Distribution and Impact of <I>Bean pod mottle virus</I> (BPMV) as a Re-emerging Virus, and <I>Soybean mosaic virus </I>(SMV) in Soybean Grown in Virginia
… max</I> (L.) Merrill), causing quality and yield loss due to seed coat mottling and seed weight reduction. Although BPMV has been known in Virginia since 1958 and has always been regarded as causing negligible losses, its impact is changing as BPMV incidence has increased in many soybean …
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Competition For Above And Below Ground Resources Among Annual Species From The Plant To The Field: Quantification Analysis And Modeling
… and crop plants is a major determinant of crop yield losses. The objectives of this study are: i) to improve the understanding of the role of weeds in water use and crop water productivity, ii) to test, through field experiments and an individual based model, the effects of size inequality and …
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Inheritance and Selection for Resistance to Phialophora Gregata in Soybeans
… between BSR disease symptoms and BSR-caused seed yield loss, and to determine the usefulness of root-dip inoculation as a means to evaluate soybeans for BSR resistance in the field.
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