Sex Attractant Traps: Their Role in the Management of Spruce Budworm
The use of sex attractant traps for monitoring population densities of spruce budworm [Choristoneura fumiferana (Clemens)] has to be viewed within the context of the techniques currently being used to estimate density. Present control strategies depend largely upon the aerial application of insecticides on high density populations. Such populations may number 50 million or more budworm/ ha, and they are easily detected by the associated defoliation which can be spotted by aerial surveys. Once detected, the necessary information for the planning of control operations can be collected by egg sampling in the fall of the previous year and by larval sampling in the spring before the control operations begin. The egg sampling permits decisions to be made on the need for protection and on the broad areas to be treated; and since it can be carried out in the fall, it provides sufficient lead time for planning and for the ordering of materials and equipment. The spring larval sampling permits final adjustments to be made in the delineation ofthe spray boundaries. Within such a strategy there is little scope for the use of sex attractant traps. Relatively few samples are required to provide the necessary accuracy of egg and larval numbers at high densities.
KeywordsRelease Rate Virgin Female Flight Period Sticky Trap Trap Catch
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