B. A. Baugh

Economic Threshold for Cotton Aphid (Hemiptera: Aphididae) on Cotton in the Southwestern United States.

ABSTRACT Cotton aphid, Aphis gossypii Glover (Hemiptera: Aphididae), is a common pest of cotton throughout much of the world. In the United States, insecticide applications targeting cotton aphid in cotton are common in the Mid-South, Texas, and California. Cotton aphid population dynamics data were collected from eight insecticide efficacy trials conducted in Lubbock, TX, over a 4-yr period. Among the field populations in the nontreated plots, the instantaneous rate of population growth averaged 0.56 ± 0.608, and the mean population doubling time was 3.97 ± 2.16 d. For calculating economic injury levels (EIL) and thresholds, control costs were set at US

EFFICACY OF INSECTICIDES TO WESTERN TARNISHED PLANT BUG IN COTTON, 2011

30.50/ha, market prices were evaluated at US

EFFICACY OF TRANSFORM AGAINST COTTON FLEAHOPPER IN COTTON, 2011

0.88, US

EVALUATION OF INSECTICIDES FOR CONTROL OF KURTOMATHRIPS MORRILLI IN COTTON, 2011

1.33, US

F46@@@EFFICACY OF INTRUDER AND TRANSFORM TOWARDS COTTON APHIDS IN COTTON, 2011

1.77, and US

EFFICACY OF INSECTICIDES AGAINST APHIDS IN COTTON, 2011

2.21 kg-lint, and cotton yield potentials were evaluated at 672, 896, and 1,120 kg-lint/ha. The EIL we calculated ranged from 66 to 272 aphids per leaf, and averaged 137 aphids per leaf. Economic thresholds (ET) were calculated based on lead times of 1, 3, 5, and 7 d before EIL occurs. The mean ET across control cost, market price, and yield potential were 110 ± 48, 70 ± 31, 45 ± 19, and 29 ± 13 aphids per leaf at lead times of 1, 3, 5, and 7 d, respectively. Most curative pest management tactics in cotton are implemented within 3 d of determining need, and the ET at 3 d that we calculated (70 ± 31 aphids per leaf) overlaps the current recommended action threshold in Texas and California of 50 aphids per leaf.