Sequential Sampling Technique for Decision Making in the Management of Cotton Aphids: Aphids gossypii Glover
A study was conducted in 2002 to examine the notable feature of sequential sampling plan and its efficiency in terms of number of observations of cotton aphids: Aphids gossypii Glover required to reach treatment decisions. The average number will be appreciably less under sequential sampling plan when operating with a fixed sample size. Sequential sampling plan based on the Negative Binomial Distribution (NBD) with common Kc = 5.4278, economic threshold level of lower limit m0 = 5 aphids per plant and upper limit of m1 = 6 aphids per plant and a risk factors α and β were set at 0.10 level was developed for using in the control of Cotton Aphids: Aphids gossypii Glover. In addition Operative Characteristic (OC) and Average Sample Number (ASN) curves were studied for predicting the probable number of samples required for different population densities. Results here suggest that the average number of aphids will be appreciably less under Sequential Sampling to make a treatment decisions. The shape of the OC curve depicts the behaviour of the sampling plan.
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