Behavioral response of Ostrinia furnacalis and its natural enemies to selected plants and weeds closely associated with corn
2007
Calumpang, S.M.F. | Medina, J.R., Philippines Univ. Los Baños, College, Laguna (Philippines)
Companion planting and diversified planting utilize volatile plant chemicals which affect insect behavior.Companion planting is a cultural practice that uses plants with some insect-repellent interspersed with other plants.Plant chemistry is a very important source of information for insect which determine its oviposition behavior and its choice of a host plant.Acceptance or rejection of a plant is determined by the overall effect of the opposing positive and negative semichemical cues that the insect receives from the environment.The identification of plants (Crops or weeds)that provide semichemical beneficial to crops, such as repellant for the insect pest and/or intercrops or companion plants, thus reducing the need for chemical control. Bioassays were conducted to determine suitable companion plants for corn that will enhance repellancy for the corn borer or attractancy for natural enemies closely associated with corn. Results from bioassays conducted on corn borer and natural enemies Trichogramma and Earwigs for oviposition, predatory and olfactory response show indicators that oregano, lemon grass and Roselle would be good companion plants for corn. These plants may serve as oviposition sites for corn borer but do not support larval growth. The effect of these plants were also evaluated against natural enemies found in corn. Result show attractiveness of the extract to Trichogramma evanescens thus increasing the apparency of its host, corn borer larvae and increasing the probability of parasitization. Earwigs were not repelled by the chemicals found in oregano and lemon grass,among others.
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