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
Recommended Citation
Navasero, M. V.; Gonzales, P. G.; Bayot, R. G.; and Zorilla, R. A., "Control of tomato fruitworm, Helicoverpa armigera (Hubn), (Noctuidae, Lepidoptera) using nuclear polyhedrosis virus and Trichogramma chilonis" (2003). Journal Article. 5708.
https://www.ukdr.uplb.edu.ph/journal-articles/5708
En – AGROVOC descriptors
HELICOVERPA ARMIGERA; TRICHOGRAMMA CHILONIS; LYCOPERSICON ESCULENTUM; FRUITS; NUCLEAR POLYHEDROSIS VIRUS; PLANT PESTS