Utilization of an egg parasitoid in rice black bug management

Issue Date

10-2003

Abstract

Monitoring and collection of egg masses of rice black bug, Scotinophora coarctata Fabr., was done to determine field occurrence of egg parasitoid Telenomus triptus. based on parasitized eggs, T. triptus was more abundant (55% parasitism) during the early stages of crop growth than during the reproductive stage (24% parasitism).Laboratory evaluation on the effect of the number of egg parasitoids on egg parasitism showed that percentage egg parasitism increased as the number of egg parasitoids increased. Highest parasitism (87%) was observed two days after release of two egg parasitoids/egg mass. Daily observation on egg parasitism showed that parasitism increased with time regardless of the number of egg parasitoids released. Percentage parasitism decreased as the number of egg masses increased. Field evaluation showed the highest parasitism (72%) or 81% increase in parasitism in fields with 168,000 newly emerged parasitoids/ha.

Source or Periodical Title

Philippine Entomologist

ISSN

0048-3753

Volume

17

Issue

2

Page

184

Document Type

Article

Frequency

semi-annually

Language

English

En – AGROVOC descriptors

SCOTINOPHARA; PESTS; PLANT PESTS; PARASITOIDS; PARASITISM; BIOLOGICAL CONTROL AGENTS; PEST MANAGEMENT

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