Control of tomato fruitworm, Helicoverpa armigera (Hubn), (Noctuidae, Lepidoptera) using nuclear polyhedrosis virus and Trichogramma chilonis

Issue Date

10-2003

Abstract

Helicoverpa armigera nuclear polyhedrosis virus (HaNPV) and Trichogramma chilonis were mass produced in the laboratory. These were used in the field trial at the Central Experiment Station (CES), UPLB and in the farmer's field in Barangay Taytay, Majayjay, Laguna. Egg and larval populations of H. armigera were monitored at weekly interval and the biological control agents were released when the economic threshold level was reached (1 egg mass/20 plants or 1 larva/2 plants). Results of the CES experiment, where populations of H. armigera was high, showed that the effect of HaNPV alone, or in combination with T. chilonis, was comparable with that of the farmer's practice of weekly application of insecticide to control H. armigera. Marketable tomato fruit yields ranging from 40.6 to 42.5 t/ha were obtained when the biological control agents were used compared with only 6.8 t/ha in untreated plots. However, in farmer's field in Taytay, Majayjay where the population of H. armigera was low, no significant differences in marketable yield were observed among the treatments.

Source or Periodical Title

Philippine Entomologist

ISSN

0048-3753

Volume

17

Issue

2

Page

185

Document Type

Article

Frequency

semi-annually

Language

English

En – AGROVOC descriptors

HELICOVERPA ARMIGERA; TRICHOGRAMMA CHILONIS; LYCOPERSICON ESCULENTUM; FRUITS; NUCLEAR POLYHEDROSIS VIRUS; PLANT PESTS

This document is currently not available here.

Share

COinS