Occurrence and succession of thrips fauna and their predators on irrigated, transplanted rice
1994
Reyes, C.P. | Rillon, G.S. (Philippine Rice Research Inst., Maligaya, Munoz, Nueva Ecija (Philippines))
The occurrence and succession of thrips fauna and their predators on irrigated, transplanted rice plants grown in Maligaya Experiment Station (Nueva Ecija, Luzon [Philippines]) were monitored during one cropping season (Jul 20 to Dec 4, 1991). Tullgren funnel, yellow pan trap (wet and dry) and dissection of plant parts were used as collecting techniques. Sampling was done weekly from 20 days after transplanting to maturity. Six species were recovered and classified into three trophic groups, viz., phytophages: Anaphothrips sudanensis Trybom, Bolacothrips graminis Priesner, Stenchaetothrips biformis (Bagnall) and Caliothrips striatopterus (Kubos); predator; Haplothrips ganglbaveri Schmutz; saprophage: Nesothrips lativentris Karmy. H. ganglbaveri gave the highest count and was present in different growth stages of rice plant. A. sudanensis, B. graminis, N. lativentris, C. striatopterus and S. biformis were sporadic. No arthropod was found as potential predator of the above mentioned phytophagous thrips. Stenchaetothrips biformis Bagnall, a known pest of rice plants in the Philippines and the Orient was collected only on IR's 28 and 36 in a very low number. In general, the population of thrips in the experimental area is very low and hardly support a pest situation contrary to what was observed in Visayas and Mindanao. As regards the different varieties used, IR48 supported the highest number of thrips, followed by IR32 and IR42. Wet and dry pan collecting techniques yielded the highest count of thrips. The flower stage of rice plant harbored the most number of thrips than any other growth stage
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