DAMAGE TO COWPEA BY THE LEGUME POD BORER, MARUCA-TESTULALIS GEYER, AS INFLUENCED BY INFESTATION DENSITY IN NIGERIA

被引：6

作者：

OGUNWOLU, EO

机构：

[1] Department of Crop Production, University of Agriculture, Makurdi

来源：

TROPICAL PEST MANAGEMENT | 1990年 / 36卷 / 02期

关键词：

Cowpea; Damage; Economic threshold; Legume pod borer;

D O I：

10.1080/09670879009371457

中图分类号：

S3 [农学（农艺学）];

学科分类号：

0901 ;

摘要：

In experiments at Makurdi, Nigeria, to quantify the damage to cowpea by different densities of the legume pod borer (LPB), Maruca testulalis cypermethrin 10 EC was sprayed at 0.2 kg/ha a.i. to control larvae when its infestation in flowers reached 10, 20, 30, 40 and 50% in 1985 and 10, 20 and 30% in 1986. Larval damage to the flowers and pods increased with the percentage infestation and reduced the yield to 72.1% in 1985 and 48.1% in 1986. A provisional action threshold of 40% larval infestation in flowers was established, based on the increased damage caused by this level of infestation in flowers and pods and the reduction in yield compared with a > 10% pre‐spray infestation. © 1990 Taylor and Francis Ltd.

引用

页码：138 / 140

页数：3

共 19 条

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[2]

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