Chemical Control of the Sugar Cane Froghopper Aeneolamia Varia Saccharina (distant)
نویسندگان
چکیده
ENTOMOLOGY I MR. SANCHEZ NAVARETTE : NO. DR. WIEHE : DO not 'dead hearts' result in some of the drier parts of Mauritius ? MR. WILLIAMS: When there are several borers near the top of a stalk, the top may die. This is different from a 'dead heart'. MR. SANCHEZ NAVARETTE : IS it easy to find several larvae in a single stalk ? MR. WILLIAMS: NO. We usually find one or two. D. W. FEWKES (Trinidad) : In Trinidad we have three species of Diatraea and they do cause 'dead hearts' but only in young shoots, not in mature canes. Do you have any estimates of the damage caused by your stalk borer in Mauritius which can be used to gauge the effectiveness of parasites introduced for biological control. MR. WILLIAMS: No. We have, in fact, only succeeded in establishing one useful parasite species. MR. MAMET: We make counts of borer infestation in our variety trials but this, of course, is for the purpose of assessing varietal resistance.
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