DAMAGE THRESHOLD FOR DIAPHANIA-INDICA SAUNDERS (LEPIDOPTERA, PYRALIDAE) ON CUCUMBERS IN GUAM

被引：7

作者：

SCHREINER, IH

机构：

[1] College of Agriculture and Life Sciences, University of Guam, Mangilao

来源：

TROPICAL PEST MANAGEMENT | 1991年 / 37卷 / 01期

关键词：

YIELD LOSS; MELON WORM; FOLIAR DAMAGE; MELON THRIPS;

D O I：

10.1080/09670879109371530

中图分类号：

S3 [农学（农艺学）];

学科分类号：

0901 ;

摘要：

Diaphania indica Saunders larvae feed on cucumber leaves, almost defoliating plants when populations are high. Using insecticide treatments, population levels of caterpillars were manipulated in cucumber plantings. Carbaryl, dimethoate and Bacillus thuringiensis were effective in reducing caterpillar populations. Regression analysis of yield of cucumbers on D. indica populations per leaf showed that yield loss was approximately 10% when D. indica populations reached one per leaf. Yield loss could not be detected below this level. Yield loss increased linearly as populations increased above 1 per leaf. Moderate populations of Thrips palmi Karny, up to 80 thrips per leaf, in one of the three trials had no significant effect on yield.

引用

页码：17 / 20

页数：4

共 7 条

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