Host preferences,parasitism levels and effect of plant development on parasitism of Plutella zylostella and Pseudoplusia includens by Trichogramma pretiosum in cabbage in Puerto Rico
We investigated field parasitism of diamondback moth(DBM),Plutella xylostella(L.),and soybean looper(SL),Pseudoplusia includens(Walker),eggs by Trichogramma pretiosum Riley in Puerto Rico. The overall level of parasitism of DBM and SL by T. pretiosum was not influeneed whether these hosts were present alone or together in cabbage under field conditions.Both host specieseggs were parasitized,although there was a general preference for DBM eggs. T. pretiosum generally parasitized eggs in the lower half of the plants.Consequently,the level of parasitism depended on how close to the ground host oviposition occurred. The presence of SL with DBM influenced the distribution of parasitized DBM eggs on the plants. This was apparently due to the presence of SL influencing the oviposition behavior of DBM,as indicated by the difference between the no-choice and choice treatments in the distribution of DBM eggs.A more even vertical distribution of parasitized eggs was evident in older plants,which was attributed to increased connectivity of foliage in older plants.
Richard W.H.Pluke Gary L.Leibee Angel L.Goazalez Rodriguez
Fintrac,P.O.Box 303337,St.Thomas,U.S.Virgin Islands,00803.3337 Mid-Florida Research and Education Center,Institute of Food and Agricultural Sciences,University of University of Puerto Rico
国际会议
北京
英文
369-375
2006-10-24（万方平台首次上网日期，不代表论文的发表时间）