Control of white stem borer in rice using Trichogramma japonicum Ashmead
In Caraga, the problem with white stem borer (WSB), Scirpophaga innotata Walker, coupled with type 2 climate (no defined wet or dry seasons), solar radiation, and incidence of insect pests and diseases contributed to the very low rice yield of 2.78 t/ha. This was one of the lowest yields among rice growing regions in the country.
As this problem requires vigorous but environment friendly solutions, Estoy et.al. (Phil/rice-Agusan) monitored the natural enemies of WSB. Specifically, the study determined the occurrence of the predators and parasitoids of WSB in the field and evaluated the efficiency of the egg parasitoid, Trichogramma japonicum Ashmead.
Findings
- The inundative release of T. japonicum during the panicle initiation resulted in significant increase in egg parasitism from 12% before release to 32% egg parasitism at 4 days after release.
- Consequently, this resulted in lower WSB damage, 4.625 whiteheads and yield of 5.7 t/ha.
- A net benefit of P13,000/ha was obtained when T. japonicum was used in WSB management
Source: PCARRD, 2006. Highlights 2005, Los Banos, Laguna
Organic Farming Information Network
Philippine Council for Agriculture, Forestry and Natural Resources Research
and Development (PCARRD)
©2006