IMPACT OF PALAYAMANAN FIELDS ON CONSERVATION BIOLOGICAL CONTROL IN RICE-BASED CROPPING SYSTEM
Palayamanan is a farming system that highlights the purposive integration of various farming components such as rice and other crops, livestock, fish and recycling so that nothing is wasted; everything in the farm is a precious resource ((PhilRice, 2005). A two-year study was conducted to determine the impact of Palayamanan field on conservation biological control that potentiates the possibility of Palayamanan field to serve as refuge to beneficial organisms which can provide sustainable Integrated Pest Management (IPM) in areas with large rice monoculture. Sampling of insect pests and beneficial organisms through different sampling devices and techniques and at varying crop growth stages in the Crop Protection Division (CPD) rice field, Palayamanan rice field and vegetable area of Palayamanan was conducted. Prey enrichment method was also used to evaluate the extent of mortality caused by parasitoids on eggs of the brown planthopper (BPH).
Results in 2011 dry and wet seasons showed that densities of rice leafhoppers and planthoppers were relatively low in Palayamanan rice field compared to those in rice monoculture in the Crop Protection Division (CPD) field. Dense populations of beneficial organisms and incidence of BPH egg parasitism were recorded during the dry season of 2012 and wet seasons of 2011 and 2012 in the Palayamanan rice field. Parasitism of BPH eggs was highest in the Palayamanan vegetable area which indicated that parasitoids of BPH colonized this area to feed on honey and pollen on flowers of vegetable plants. The area serves as refuge for these beneficial organisms from the rice field.
Key words: conservation biological control, ecological engineering, integrated pest management, Palayamanan, rice-based farming systems
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