Insect pest populations, natural enemies and pest injuries as affected by intensified cropping systems in Nueva Ecija and Bulacan [Philippines]
2015
Gabriel, A.J. | Pillon, G.S. | Casimero, V.V. | Arida, G.S. | Marquez, L.V.
Pest assessment was conducted to determine the effects of five cropping seasons in a period of two years (5-in-2) and ratoon crop between seasons on the populations of insect pests and their natural enemies, and the occurrence and severity of diseases in selected towns in the provinces of Bulacan and Nueva Ecija. There were patterns of increased incidence of fungal diseases and rat damage was regularly recorded in fields especially those areas which followed the 5-in-2 program. In the case of ratoon rice, incidence of bacterial leaf blight and leaf streak were commonly observed. Generally, there was a low population of insect pests both 5-in-2 and ratoon rice cultivation schemes which was attributed to the sufficient number of natural enemies to regulate their population during the monitoring from 2012 to 2014. As pests are expected to increase in any cropping intensification, it was suggested that management of pests in this scheme should include the use of resistant varieties, close and effective pest monitoring, and the timely application of interventions such as appropriate cultural and biologically intensive pest management strategies in cases of impending pest outbreaks.
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