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United States Department of Agriculture

Agricultural Research Service

Research Project: GENETIC IMPROVEMENT OF MAIZE AND PEARL MILLET FOR RESISTANCE TO INSECTS AND AFLATOXIN

Location: Crop Genetics and Breeding Research

Title: Patterns of host adaptation in Frankliniella occidentalis among vegetable crops

Authors
item Lei, Zhongren -
item Wang, Haihong -
item Ni, Xinzhi

Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: April 30, 2012
Publication Date: August 19, 2012
Citation: Lei, Z., Wang, H., Ni, X. 2012. Patterns of host adaptation in Frankliniella occidentalis among vegetable crops. International Congress of Entomology, August 19-25, 2012, Daegu, Korea. Abstract S1009TU11.

Interpretive Summary: not required

Technical Abstract: The current study examined the variation in life table characteristics, and physiological, biochemical, and molecular bases of western flower thrips, Frankliniella occidentalis (Pergande) host adaptation patterns. The main objective was to determine whether host availability affects insect preference or population diversion on different hosts throughout the field season of vegetable crop production. Three vegetable hosts were used in the study. They were bean, garlic and pepper. Host shift made F. occidentalis offspring displayed longer developmental time, lower survival rate, lower oviposition rate, especially at the F1 generation, but the reduction recovered in the following generations. Host-returning test showed that F. occidentalis biological characteristics recovered, but still showed significant difference with original host population and adaptive host population. Hybridization made F. occidentalis populations between different hosts showed that host preference and other biological characteristics were never as strong as its parental populations. Detoxification enzyme activity bioassays showed F. occidentalis could activate its detoxification enzymes to cope the allelochemicals in the new host, especially at the initial stage of host change test. The detoxification enzyme activity was the highest within 24 h. After six generations, the detoxification enzyme activity was relatively stabilized, but it was still higher than the thrips fed on the control. When the differentiation among 5 populations was examined using RAPD technique, the study revealed there was a significant differentiation in these host-specific populations. The ramifications of host shift of pests in integrated pest management on vegetable crops are also discussed.

Last Modified: 8/27/2014
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