NDLI: Economic thresholds of Thrips palmi (Thysanoptera: Thripidae) for eggplants in a greenhouse

Content Provider	Springer Nature Link
Author	Yadav, Ramchandra Chang, Niann Tai
Copyright Year	2013
Abstract	Thrips palmi Karny has recently been implicated in damage to eggplant fruits. This thrips causes cosmetic scars on and deforms fruits, thus lowering their market value. To investigate the relationship between the density of thrips and the resulting damage, experimental plots with initial release densities of 0, 20, 40, 70, and 100 adults thrips per plot were established under greenhouse conditions. Thrips density (for flower sampling = x $_{1}$; for sticky trap = x $_{2}$) was monitored using flower sampling and blue sticky trap counts, and was found to be directly related to the proportion of damaged-fruits (y) and the reduction in fruit yield: significant relationships were found for the flower samples (y = 1.2261x $_{1}$ − 0.6232, r $^{2}$ = 0.8582) and for the trap catches (y = 11.667 ln(x $_{2}$) − 9.5, r $^{2}$ = 0.8896). The proportion of damaged fruits that could be tolerated from an economic perspective, based on the cost of controlling the thrips population chemically and the market value of the fruit, was 6.67–11.76 %; this translated into economic thresholds of 1.05–1.5 adults and/or larvae of T. palmi per flower or 4.91–10.17 adults T. palmi per four-day sticky card count.
Starting Page	195
Ending Page	204
Page Count	10
File Format	PDF
ISSN	00036862
Journal	Applied Entomology and Zoology
Volume Number	48
Issue Number	2
e-ISSN	1347605X
Language	English
Publisher	Springer Japan
Publisher Date	2013-03-19
Publisher Place	Japan
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Economic threshold Thrips palmi Eggplant Greenhouse Entomology Agriculture Applied Ecology Plant Pathology Zoology Environmental Management
Content Type	Text
Resource Type	Article
Subject	Insect Science

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