Host patch structure and cropping systems affecting density of coconut scale insects (CSI), Aspidiotus spp., in Region 4A [Cavite, Laguna, Batangas, Rizal, Quezon, Philippines] coconut landscapes
2016
Medillo, J.V. | Medina, C.dR. | Velasco, L.R.I.
The abundance and distribution of coconut scale insects (CSI), Aspidiotus spp. (Hemiptera: Sternorrhyncha: Diaspididae) was studied in relations to the landscapes structure in Region IVA [Cavite, Laguna, Batangas, Rizal, Quezon, Philippines]. An area wide stratified purposive sampling in 50 x 50 m site done in patchy and contiguous coconut farms. Higher insect density in patchy compared to contiguous landscapes was observed in 0.05% confidence. Number of alive and dead insects in patchy host were higher; 178.74, 141.10; and 42.97, 79.19 in contiguous hosts. Cropping systems affected insect densities. It is higher in intercrop systems. This study showed that CSI prefer pathced landscape, suggesting that resource concentration by Root (1973) is not applicable. Important factors like host plant quality, favorable environment conditions, alternate hosts, and cropping systems are important factors in a host patch structure for a successful colonization.
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