Pink Bollworm: 1 Response to Various Emission Rates of Gossyplure in the Field 23

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Abstract
Rubber septa used as substrates for gossyplure (1:1 ratio of Z,Z -and Z,E -isomers of hexadecadienyl acetate), the sex pheromone of the pink bollworm, Pectinophora gossypiella (Saunders), produced 1st-order loss curves with a half-life of 159 days in the laboratory (release rate constant, k = 1.8×10 −4 h −1 ) and an avg half-life of 120 days in the field (k = 2.4× −4 h −1 ; the rate of evaporation equals kM where M is the amount of pheromone on the septa at a given time). Male moths responded equally well to emission rates of 0.012–0.98 μ g/h in field tests conducted May and July and 0.084–8.8 μ g/h in Sept. Baits emitting in the range of ca. 0.2–2 μ g/h (3570 μ g/septum) would be attractive throughout a 6-mo season. Single virgin native female moths were as attractive as septa baits treated with 1000 μ g of gossyplure in trapping tests conducted in the field. Males showed the same diurnal rhythm in responding to female moths and to the baits.