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Mortality of adult Helicoverpa zea (Lepidoptera: Noctuidae) in cotton treated with a feeding-based attracticide
Abstract
Applications of a sucrose syrup-based feeding stimulant/toxicant mixture in one row wide strips for killing adult Helicoverpa zea in corn and cotton were made in several geographic locations in Texas. These areas were the Lower Rio Grande Valley, Coastal Plains, Brazos River Valley, and High Plains. Results indicated that the feeding stimulant/toxicant mixture was very effective for killing large numbers of adult corn earworm (CEW) in corn and cotton using a relatively small amount of insecticide. Mean numbers (±SEM) of adult CEW killed per treated row m per day in corn ranged from 23.1 (±2.5) in the Coastal Plains to 1.0 (±0.2) in the High Plains. In the Coastal Plains, it was estimated that almost a million moths would be killed by treating one row width equivalent of one ha in length over a 4-d interval, requiring only 20 g ai wt/vol methomyl 90S combined with 190 liters (50 gal) of feeding stimulant. Results involving aerial application of the feeding stimulant/toxicant mixture in corn indicated that this technique would be feasible for an areawide management program. Studies were also conducted to determine if a 5-component feeding attractant blend identified previously from Gaura drummondii when used in conjunction with a feeding stimulant/toxicant mixture would increase efficacy in killing adult CEW. No significant differences were found in treatments with the attractant when compared to treatments without the attractant. Optimum spacing studies in corn of the feeding stimulant/toxicant mixture in one m wide row strips spaced 10, 20, 40, 60 and > 60 rows apart indicated that treating every 10 rows would be overtreating. Preliminary evidence suggested that the optimum spacing of one row wide strips should be around 30 to 40 rows; however, additional studies are needed. In conclusion, it was determined that large numbers of adults could be killed in corn and cotton by ground or aerial one m wide row strip applications of a feeding stimulant/toxicant mixture, use of a feeding attractant did not increase the killing efficacy of the feeding stimulant/toxicant mixture, and additional studies are needed to determine the optimum spacing of treated row strips.
Description
Due to the character of the original source materials and the nature of batch digitization, quality control issues may be present in this document. Please report any quality issues you encounter to digital@library.tamu.edu, referencing the URI of the item.Includes bibliographical references (leaves 70-73).
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Citation
Younger, Cole David (2000). Mortality of adult Helicoverpa zea (Lepidoptera: Noctuidae) in cotton treated with a feeding-based attracticide. Master's thesis, Texas A&M University. Available electronically from https : / /hdl .handle .net /1969 .1 /ETD -TAMU -2000 -THESIS -Y57.
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