Formulations slow release, effectiveness under

Field measurements of concentrations of disparlure in air under woodland plots treated with three different slow release formulations showed that all released pheromone for about one month concentrations decreased about 80 in the first five days and 90-98 over 35 days. Between 75 and 85 of the disparlure remained in the formulations after 35 days even though release had became very slow. Measurements with other formulations containing tetradecenol formate applied to corn showed these were more efficient but not persistent enough to control Heliothis Zea for more than one month. No satisfactory measurements of concentrations in vapor plumes from point sources were possible even though these may be as effective as broadcasts. Further field research is limited by sampling and analysis techniques and the need for better micrometeorological data. 

Table II. Effectiveness of slow release formulations under field conditions.

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