The Experts below are selected from a list of 3033 Experts worldwide ranked by ideXlab platform
John C. Palumbo - One of the best experts on this subject based on the ideXlab platform.
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comparison of foliar insecticide alternatives for control of lepidopterous larvae in Head Lettuce 2014
Arthropod Management Tests, 2015Co-Authors: John C. PalumboAbstract:The objective of this trial was to compare the efficacy of foliar insecticide alternatives currently used in conventional Lettuce production under fall growing conditions. Head Lettuce “El Guapo” was direct seeded into double row beds on 42-inch centers on 6 Sep 2014. Plots were two beds wide by 40 ft long and bordered by two untreated beds. Stand establishment was achieved using overHead sprinkler irrigation, and irrigated with furrow irrigation thereafter. Four replications of each treatment were arranged in a RCB design. Formulations and rates for each compound are provided in the tables. Three foliar sprays were applied on 5, 17 Oct, and 12 Nov with a CO2 …
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evaluation of sequoia and movento for control of western flower thrips on Head Lettuce 2014
Arthropod Management Tests, 2015Co-Authors: John C. PalumboAbstract:The objective of the trial was to evaluate the efficacy of the aphicides Sequoia and Movento against western flower thrips relative to the industry standards on romaine Lettuce. Head Lettuce ‘Pennylea’ was direct seeded on 5 December 2013 at the Yuma Valley Agricultural Center, Yuma, AZ, into double row beds on 42-inch centers. Stand establishment was achieved using overHead sprinkler irrigation, and irrigated with furrow irrigation thereafter. Plots were two beds wide by 35 ft long and bordered by two untreated beds. Four replications of each treatment were arranged in an RCB design. Formulations and rates for each compound are …
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Lettuce Head lactuca sativa l var capitata l diamondback cross spectrum insect control with verimark in Head Lettuce 2011
2012Co-Authors: John C. PalumboAbstract:The objective of this trial was to evaluate the efficacy of a new experimental compound for cross-spectrum (sucking and chewing insect pests) control of major insects in Head Lettuce under fall growing conditions. Head Lettuce 'Diamondback' was direct seeded into double row beds on 42 inch centers on 8 Sep, 2011. Plots were two beds wide by 75 ft long and bordered by two untreated beds. Stand establishment was achieved using overHead sprinkler irrigation, and irrigated with furrow irrigation thereafter. Four replications of each treatment were arranged in a RCB design. Formulations and rates for each compound are provided in the tables. Sub-surface, soil injection treatments were applied by placing the insecticides 1.5 inches directly below each seed line with a modified fertilizer shank just prior to planting in a total water volume of 20.5 gpa. No other insecticide application was applied during the trial. At various intervals after planting (DAP), 10 plants were randomly selected from each replicate and destructively sampled for the presence of each insect species. Evaluation of LM control was conducted by examining all leaves on each plant and counting the number of mines on each leaf. BAW and CL control was based on the examination of whole plants for presence of large (2 or > instar) larvae. SWF immature densities were estimated by examining 10 leaves per replicate (collected near the base of the plant) on each sample date. Leaves were taken into the laboratory where the total number of small nymphs was counted on two 2-cm leaf discs from each leaf using a dissecting microscope. Data were subjected to ANOVA and means were separated using F-protected LSD (P ≤ 0.05).
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insect crop losses and insecticide usage for Head Lettuce in arizona 2006 2007
Vegetable Report, 2008Co-Authors: John C. Palumbo, Kurt Nolte, Al Fournier, Peter C EllsworthAbstract:Impact assessment is central to the evolution and evaluation of our local Insect Pest Management (IPM) programs. Quantifiable metrics on insecticide use patterns, costs, targets, and frequency, crop losses due to all stressors of yield and quality, and other real world economic data (e.g., crop value) are our most objective tools for assessing change in our systems. We recently initiated a project to measure the impact of insect losses and insecticide uses in Head Lettuce grown in Yuma, AZ and the Bard–Winterhaven area of Imperial County, CA. The data generated in this report is useful for responding to pesticide information requests generated by EPA, and can provide a basis for regulatory processes such as Section 18 requests, as well as for evaluating the impact of our extension programs on risk reduction to growers. This information also confirms the value of PCAs to the Lettuce industry by showing the importance of cost-effective management of insect pests in desert Lettuce production.
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insect crop losses and insecticide usage for Head Lettuce in arizona 2004 2006
Vegetable Report, 2006Co-Authors: John C. Palumbo, Kurt Nolte, Al Fournier, Peter C Ellsworth, Pat ClayAbstract:Impact assessment is central to the evolution and evaluation of our IPM programs. Quantifiable metrics on insecticide use patterns, costs, targets, and frequency, crop losses due to all stressors of yield and quality, and other real world economic data (e.g., crop value) are our most objective tools for assessing change in our systems. We recently initiated a project to measure the impact of insect losses and insecticide uses in Head Lettuce grown in Yuma, AZ and the Bard–Winterhaven area of Imperial County, CA. The data generated in this report is useful for responding to pesticide information requests generated by EPA, and can provide a basis for regulatory processes such as Section 18 or 24c requests, as well as for evaluating the impact of our extension programs on risk reduction to growers. This information also confirms the value of PCAs to the Lettuce industry by showing the importance of cost-effective management of insect pests in desert Lettuce production.
Herve Van Der Heyden - One of the best experts on this subject based on the ideXlab platform.
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soilborne inoculum density and environmental parameters influence the development of pythium stunt caused by pythium tracheiphilum in Head Lettuce crops
Plant Disease, 2019Co-Authors: Andreanne Sauvageau, Valerie Gravel, Herve Van Der HeydenAbstract:In Quebec muck soils, Pythium stunt (Pythium tracheiphilum Matta) is responsible for important yield losses in Head Lettuce crops each year, which can reach up to 50% in certain cases. Despite the significance of the disease, factors influencing its development remain poorly documented, and no disease risk indicators are available, which makes the development of management strategies difficult. Hence, growers systematically use chemical fungicides throughout the growing season to reduce crop losses. However, it is known that soilborne disease incidence or severity may be influenced by soil inoculum density and environmental parameters. Therefore, the objectives of this study were to investigate the influence of inoculum density on Lettuce growth under controlled conditions and evaluate the influence of soil inoculum density, air temperature, relative humidity, and rainfall on disease incidence under field conditions. In particular, this study aims to develop accurate predictors for Pythium stunt incidence. Results showed that, under controlled environment, thresholds of inoculum density of 97 and 46 propagules per gram of dry soil were needed to reduce Lettuce dry weight by one-half for cultivars Estival and Prestige, respectively. These results were confirmed under field conditions, where a soil inoculum density >132 propagules per gram of dry soil combined with air temperatures 64 mm for the first 3 weeks after transplanting accurately predicted disease incidence 79% of the time. These relationships improve understanding of seasonal Pythium stunt development and will provide useful tools to develop sustainable management strategies.
Jorge M Fonseca - One of the best experts on this subject based on the ideXlab platform.
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postharvest quality and microbial population of Head Lettuce as affected by moisture at harvest
Journal of Food Science, 2006Co-Authors: Jorge M FonsecaAbstract:Iceberg Lettuce was evaluated for yield, microbial population, and postharvest quality either following different irrigation termination (IT) schedules or before and after a rainfall event. Lettuce receiving late (4 d before harvest) IT showed increased weight and diameter, higher aerobic bacteria counts, and lower quality than plants subjected to early (16 d before harvest) IT. Middle (8 d before harvest) IT produced similar yields, and lower microbial population in Lettuce than late IT. After rain, microbial population increased by 1.5 and 3.0 log colony-forming units (CFU)/g in outer and Head leaves respectively. The results revealed the importance of managing moisture conditions at harvest to enhance overall quality of Lettuce.
Hsiupao Chien - One of the best experts on this subject based on the ideXlab platform.
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insecticide residues in Head Lettuce cabbage chinese cabbage and broccoli grown in fields
Journal of Agricultural and Food Chemistry, 2014Co-Authors: Miaofan Chen, Jungfang Chen, Jingjing Syu, Chi Pei, Hsiupao ChienAbstract:The residues of four insecticides belonging to different families were studied on Head Lettuce (Lactuca sativa L. var. capitata L.), cabbage (Brassica oleracea Linn. var. capitata DC.), Chinese cabbage (Brassica pekinensis Skeels), and broccoli (Brassica oleracea var. italica) after pesticide application. To reduce application variability, a tank mix of acetamiprid 20% SP, chlorpyrifos 22.5% EC, deltamethrin 2.4% SC, and methomyl 40% SP was applied at recommended and double doses. Initial deposits of all pesticides on Head Lettuce were higher than those of the other three crops. The residues of chlorpyrifos and deltamethrin were higher than the maximum residue limits (MRLs) at recommended preharvest intervals (PHIs) on Head Lettuce and Chinese broccoli treated with higher doses. The residues of methomyl on Head Lettuce also showed the same phenomenon.
Andreanne Sauvageau - One of the best experts on this subject based on the ideXlab platform.
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soilborne inoculum density and environmental parameters influence the development of pythium stunt caused by pythium tracheiphilum in Head Lettuce crops
Plant Disease, 2019Co-Authors: Andreanne Sauvageau, Valerie Gravel, Herve Van Der HeydenAbstract:In Quebec muck soils, Pythium stunt (Pythium tracheiphilum Matta) is responsible for important yield losses in Head Lettuce crops each year, which can reach up to 50% in certain cases. Despite the significance of the disease, factors influencing its development remain poorly documented, and no disease risk indicators are available, which makes the development of management strategies difficult. Hence, growers systematically use chemical fungicides throughout the growing season to reduce crop losses. However, it is known that soilborne disease incidence or severity may be influenced by soil inoculum density and environmental parameters. Therefore, the objectives of this study were to investigate the influence of inoculum density on Lettuce growth under controlled conditions and evaluate the influence of soil inoculum density, air temperature, relative humidity, and rainfall on disease incidence under field conditions. In particular, this study aims to develop accurate predictors for Pythium stunt incidence. Results showed that, under controlled environment, thresholds of inoculum density of 97 and 46 propagules per gram of dry soil were needed to reduce Lettuce dry weight by one-half for cultivars Estival and Prestige, respectively. These results were confirmed under field conditions, where a soil inoculum density >132 propagules per gram of dry soil combined with air temperatures 64 mm for the first 3 weeks after transplanting accurately predicted disease incidence 79% of the time. These relationships improve understanding of seasonal Pythium stunt development and will provide useful tools to develop sustainable management strategies.
