Control of Bluegrass Webworm (Pediasia teterrellus Zinken) and Japanese Lawn Cutworm (Spodoptera depravata Butler) using Synthetic Sex-pheromone on Golf Course
1996 Volume 24 Issue 2 Pages 113-122
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1996 Volume 24 Issue 2 Pages 113-122
The authors investigated the feasibility of a synthetic sex pheromone as communication disruption agent for the control of turfgrass infesting moths, Bluegrass webworm (Pediasia teterrellus Zinken) and Japanese lawn cutworm (Spodoptera depravata Butler) .
Results obtained were as follows;
1) On the investigation of seasonal prevalence of occurrence against two moths, the method of pheromone traps was very simple and it was sufficiently reflected the number of generations. But a light occurrence of adults from the wintering and the later period of 2nd generation was insufficiently reflected the number of adults captured with pheromone traps.
2) A light trap was easy to deal with anyone, but the grouping of insects captured was very difficult on golf courses. On the other hand, it was a good method to follow-up the number of these two moths.
3) The effects for control of two moths with pheromone dispenser (PD) was judged as follows;
(a) For the attractant inhibiting effects, PD were set evenly on trees and bushes in golf courses at the rate of 2000 dispensers/ha. Attraction of male moths to sex pheromone traps in the PD treated area was completely inhibited throughout the period of the experiment. But the effect was reduced with the distance from PD on a fair-way.
(b) The effects of mating and mating disruptions rate against field females was compared with PD treated and untreated areas. These results were insufficient for the control of two moths.
(c) The method of tethered females was showed lower mating rate in PD treated area than untreated area.
(d) The number of inferable eggs in bluegrass webworm were increased near about in late July and reached in a peak within the late August and early September. The number of eggs in PD treated area were lower than the untreated area.
(e) The number of adults hiding into the bushes in the day-time and adults captured with the simple light trap at night were examined in two areas. In the PD treated area the number of adults were not reduced contrasting to that of the untreated area.
