Field efficacy of nuclear polyhedrosis virus (NPV) and bacillus thuringiensis (BT) for spodoptera control in yellow granex onions
Issue Date
10-1999
Abstract
Field trials in Bongabon, Nueva Ecija showed that NPV and Bt+NPV are more effective against Spodoptera larvae than Lambda-cyhalothrin. Highest larval counts were recorded in Lambda-cyhalothrin-trated and control plots. Onion yields were highest in NPV+Bt treated plots followed by Lambda-cyhalothrin-treated plots although the difference between them was not significant. The lowest yield was observed from control plots. These results show that microbial, alone or in combination, are effective alternatives to insecticide application, confirming their positive potential for Spodoptera management. The observation was based on two cropping seasons of onion in IPM-CRSP Demo Farm, Bonbon, Nueva Ecija (DS 1997-1998). Onion yields among the treatments in San Jose, Nueva Ecija also had the same trend with NPV+Bt having the highest yield but not significantly different from the rest of the treatments. However, the cutworm larval densities were too low to demonstrate the effects of the treatments on them and on onion yields. In a recent outbreak of the army worm, S. exigua, the application of NPV+Bt in Bonbon Demo Farm yielded 85% infected larvae collected from the field.
Source or Periodical Title
The Philippine Entomologist
ISSN
0048-3753
Volume
13
Issue
2
Page
159-168
Document Type
Article
Frequency
semi-annually
Physical Description
tables; graphs
Language
English
Recommended Citation
Padua, L. E.; Gapud, V. P.; Martin, E. C.; Pile, C. V.; Santiago, B. A.; Talker, N. S.; Recta, G. F.; Rajotte, E. G.; and Lapus, A. C., "Field efficacy of nuclear polyhedrosis virus (NPV) and bacillus thuringiensis (BT) for spodoptera control in yellow granex onions" (1999). Journal Article. 6492.
https://www.ukdr.uplb.edu.ph/journal-articles/6492
En – AGROVOC descriptors
ONIONS; SPODOPTERA; NUCLEAR POLYHEDROSIS VIRUS; BACILLUS THURINGIENSIS; INSECT CONTROL