Sampling plans for Cryptophlebia spp. (Lepidoptera: Tortricidae) attacking macadamia and litchi in Hawaii
Jones, V.P.
The suitability of using the presence of eggs or hatched eggs as a predictor of larval damage from Cryptophlebia spp. in macadamia and litchi was evaluated. Although larval damage or presence was not independent of egg presence, eggs were not suitable as a predictor of damage. Less than 51% of the macadamia nuts with eggs had larvae or larval damage, and <12% of the litchi fruit showed damage. Binomial sequential sampling plans were developed for both crops using the Wald sequential probability ratio test. On macadamia, the peak average sample number was <100 nuts, and when the percentage of infested nuts was <8 or >25%, the average sample number was <50 nuts. Peak average sample number required for litchi was approximately 220 fruit because the thresholds for damage are lower than on macadamia. If damage to litchi is >10%, then the average sample number is <50 fruit.
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