DEVELOPMENT OF AN OPTIMAL MONITORING PROGRAM IN COTTON - EMPHASIS ON SPIDERMITES AND HELIOTHIS SPP
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To develop a monitoring program requires that not only the spatial pattern of distribution of a species be known, but also the cost of sampling the area(s) within the host plants occupied by a species. As sample unit size (plant, branch, leaf, etc.) decreases, cost to sample each unit decreases, while the number of units required to estimate a population parameter with a given reliability increases. The concept of costreliability allows for available sampling procedures to be compared and the best one to be chosen. The paper discusses several ways in which monitoring costs have been reduced for Tetranychus spp., Heliothis spp. and predators without reducing the reliability of the estimate. These include the use of subsampling plans, binomial sampling and sequential sampling. 1982 Balthazar Publications.
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