Showing posts from September, 2015

The two pheromone formulations

The two pheromone formulations of microcapsules (differed only in orfralure concentration: 2 and 0°70) were tested in other plots (20 g lure per hectare per treatment). Thus, the level »f lure per hectare in the dispensers was about 1/24 that in the microcapsules. In the first 9 weeks of the test, the 2 and 10°70 capsules reduced trap catch 92 and respectively; the dispensers produced a 78°70 decrease. After the retreatment, the dispensers reduced trap catch 99°70; and the 2 and 10°70 capsules formulations produced reductions of 89 and 98°70, respectively according to many others.
Over the whole 24-week test, all treated plots ih0W€d a 90 to 96°70 reduction in trap catch. The infestation level during this test was it least ten times greater than that of the preceding year, and twig damage was so extensive that significant reduction as a result of treatment with lure was not expected. Nevertheless, the 2 and 10°70 capsules did reduce damage 36 and 18°70, respectively; no reduction was o…

Pheromones were applied ten times


Pheromone Release and Mating Success

Close-in mating activity, as observed by Richerson et al.,“ was described as follows: The male approaches the female usually from above, rarely from below. Final short- range orientation (25 to 30 cm) is a straight line run at the female. After initial contact with the female‘: head, thorax. or win: (rarely with the abdomen). Learn about pheromones at
D. Factors Affecting Pheromone Release and Mating Success
Richerson and Cameron“ found that the female would not reach maximum attractiveness until the second or third day of adult life, a conclusion supported by field observations of Boness.“ On the other hand, Richerson et al.“ found little difference in the mating potential of 1- to 3-day-old females, but reported that mating success decreased greatly from the 4th day onward. Collins and Potts‘ reported that virgin females remained attractive to males until death (up to 17 days in one instance).
The amount of pheromone released by an individual female …