CP 28 Pheromones
CP-28 pheromones appeared to become distorted and lose their contents rapidly; a failure was probably associated with high humidity.
For initial screening, candidate formulations spread on microscope slides were ht outdoors in a protected location, and the release rates and amounts of residual pheromone were measured as the formulations aged. Similarly prepared slides were exposed to the effects of weathering by sun, wind, and rain. These factors had a considerable effect on the lifetime of the formulation of pheromone cologne. For example, microcapsules exposed weathering outdoors lost half their disparlure content in 10 to 34 days; in the laboratory, about 123 days were required. Matrix and microcapsule formulations appeal to release pheromone at a higher rate for the first few days; then the rate slower decline. Formulations selected for field testing were those that appeared capable of releasing pheromone over an extended period at a rate that did not decline rapidly. Although stickers reduce the emission rate of the pheromone, no more the 1% of RA-1645 could be used because 2% reduced the emission rate from NCR micro capsules or MGK material by 50%. Learn more about CP-28 Pheromones | Pheromones-Planet.com.
The results of the Massachusetts and Maryland tests are shown in Table 2, when the formulations are ranked on the basis of effectiveness. Although there were : statistically significant differences among the results of the top performers, the 191 NCR 2% percent formulation, which produced mating reductions of 98 and 83% I respectively, in Maryland and Massachusetts, was the most effective. It was reassuring that the 1975-NCR 2% formulation reduced mating by 80% in Maryland and 68% Massachusetts, because in the 1975 tests a figure of 80% had been obtained for the same formulation in Maryland. Thus, the improved success of the I976-NCR 2% formulation resulted, at least in part. from the use of a new sticker. Learn more at http://pheromones-4u.com/46/
From examination of the mating figures throughout the flight season, it may be inferred that differences in population density influenced attempts to reduce mating. This is borne out by the differences between the two geographical areas and also by the increased incidence of mating in all treated areas as peak mating was reached in the control plots without pheromone traps.
The test provided useful guidance for further studies of pheromone formulations and also indicated that rate and frequency of application should be examined.
D. Mating Disruption Tests With NCR Microcapsule Pheromone Formulations, 1978
In 1978, formulation designated as 1976-NCR-2 was compared with a modified microcapsule formulation." The latter, 1978-NCR-2, differed only in that the capsules were 20 to 60 u in diameter, compared with 50 to 250 p for the 1976-NCR-2 formulation. There were three replicate plots for each treatment. The 1978-NCR-2 formulation was applied at rates of 50 and 5 g disparlure per hectare, and the 1976-NCR-2 formulation was applied at a rate of 50 g disparlure per hectare. Learn more about pheromones at http://pomm79.moonfruit.com/blog/4588864419/The-Sex-Pheromone/10102155
Also, in this test, an attempt was made to compare monitoring techniques: female gypsy moths were placed in the plots, and the recovered females were examined for presence of sperm. Recovered egg masses were later examined for evidence of embryonation. Reduction of trap catch was used as a measure of effectiveness in plots treated at the two dose rates. The attractant used in these traps was (+ )—disparlure, and it is noteworthy that the traps caught males even when no females in the control plots were mated.