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ARS Home » Research » Publications at this Location » Publication #93265
Title: COMPARATIVE LIFE TABLE STUDIES OF BEMISIA UNDER DIFFERENT MANAGEMENT STRATEGIES IN COTTON

Author
item Naranjo, Steven
item ELLSWORTH, PETER - UNIV OF AZ, MARICOPA, AZ
item DIEHL, JONATHAN - UNIV OF AZ, MARICOPA, AZ

Submitted to: National Research and Action Plan for Silver Leaf Whitefly
Publication Type: Abstract Only
Publication Acceptance Date: 6/1/1998
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: As part of a continuing study to evaluate and demonstrate strategies for Bemisia management we quantified in situ sources of mortality of immature whitefly stages in untreated plots and in plots under three different insecticide regimes (buprofezin followed by pyriproxyfen, pyriproxyfen followed by buprofezin, and a rotation of conventional materials). Each treatment was replicated 4 times in 0.27 hectare plots. Whitefly populations were monitored weekly and all insecticides were applied according to recommended action thresholds. Life table studies were conducted in replicate plots during 4 periods over the season. Cohorts of eggs and settled 1st instar nymphs were established from natural populations in each of 16-20 plots in late-July, mid-August and late- August. An initial analysis also was conducted on cohorts established in clip-cages during late June before natural populations had colonized our plots in sufficient numbers to establish the study. Cohorts consisted of approximately 50 individuals of each stage in each plot. The location of individuals on leaves was marked with a non-toxic felt-tip pen. The fate of each individual was then tracked by visual observation with a hand lens every 2-3 days. We attempted to estimate mortality due to insecticides, predators, parasitoids, and weather.