Evaluation Of The Role Of Some Biocides In Potato Integrated Pest Managment Program Adainst The Potato Tuber Moth

• M. Y. lbrahim.
• GCSAR, Agricultral Research Center in Hams, Syria.

Abstract

The potato tuber moth, Phthorimaea opercullella Zeller is one of the serious pests of potato crop in the fields and stores. The total fecundity (Mx) values were 59.57, 75.5 & 76.07 eggs/female, and age-specific survival rate was 15 & 21 days for the female when their larvae were fed on tubers treated by Bacillus thuringiensis (B.t.) and Lantana extract, respectively. Whereas, no female moths were obtained when larvae were fed on tubers treated with granulosis virus (GV). Net reproductive rate (Ro) was 1.501, 6.746 & 0.000 for females/female larvae fed on tubers contaminated with B.t., plant extract of Lantana and GV, respectively. Generation duration (Gt) was 33.71 & 34.12 days when larvae were fed on potato tubers treated with plant extract of Lantana and B.t., respectively. The generation duration was comparatively short i.e. 26.569 days, when larvae were fed on untreated tubers. The intrinsic rate (rm) was 0.091 0.087 & 0.00 individuals/female/day, and the finite rate of increase values were 0.019, 1.091& 0.00 individuals/female/day, for larvae fed on potato tubers treated with B. t., Lantana extract and GV respectively. Population Ph. operculella doubling time (D.t.) doubled once every 45.715 & 9.984 days when larvae were fed on tubers treated with B.t. or Lantana extract, respectively. When tubers were treated with GV, larvae died at metamorphosis. The potato tuber moth contaminated with B.t. demonstrated the highest recorded mortality percentages. Meanwhile, Lantana extract, came next in this respect.