Can. Ent. 109: 1375Ent. 109: -1386Ent. 109: (1977 A method is described for partitioning normal plant fruit shedding losses from those caused by the pest Lygus hesperus Knight. The relationship between age of bug and its damaged rate per day degree was determined, and used to assess the impact of various lygus population levels on crop development and yield. A simulation model for lygus phenology and population dynamics is reported.

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This paper presents results of a multidisciplinary optimization study on the impact of Lygus hesperus Knight on cotton in the Great Central Valley of California. The results of the empirical studies indicate that lygus bug is not a serious pest of cotton under most circumstances and, furthermore, illustrate why cotton yield enhancements have occurred when their populations have not been controlled. An economic analysis of these results sheds some light on the concept of economic threshold. In particular it is shown how in this case an economic threshold exists even if the costs of pesticides are zero. The theoretical implications of these results are quite general.

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