Establishment of Trichogramma evanescens in previously released and unreleased cornfields to control the Asian cornborer in Region 11 [Philippines]
1991
Garcia, A.S. | Agulan, D.S. (Regional Crop Protection Center, Davao City (Philippines))
The earliest planted corn field with an area of one hectare was released with 50 tricho cards at a distance of 14m x 14m square and monitored for cornborer egg masses, parasitized, unparasitized (fresh) and hatched. A weekly monitoring was undertaken up to silking stage of corn growth. Other corn fields planted later and in staggered manner were used as recovery fields for Trichogramma presence based on parasitized cornborer (CB) egg mass and not released with the parasitoid. In South Cotabato [Philippines], the presence of parasitized CB egg masses in non-released areas were monitored once as comparison if similar observation occurred. Results indicated that in Malagos, Davao City the parasitoid follow its host in the neighboring corn fields one hundred meters away from the previously released field by the presence of parasitized corn borer egg masses. Similar results were obtained in South Cotabato even if the non-released area is about one kilometer away from the released area. The most interesting and convincing results have shown that the parasitoid become established in sites where inoculative release has been done when after a long dry spell of five months, the new planting of corn showed CB egg masses that were highly parasitized by Trichogramma evanescens
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