EFFECTS OF THE JUVENILE HORMONE MIMIC S-31183 AND TRIFLURON ON DEVELOPMENT OF TEA SCALE (HOMOPTERA: DIASPIDIDAE)

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Abstract
The juvenile hormone mimic S-31183 and the chitin synthesis inhibitor trifluron were compared to bendiocarb and evaluated for efficacy against all stages of the tea scale, Fiorinia theae Green on potted Camellia japonica L. plants. Three applications of S-31183 produced a mean mortality greater than but not significantly different from the mortality in the bendiocarb treatment. Based on infestation ratings, plants treated with either compound had less scale than the check 13 weeks post-treatment. Mortality in the trifluron treatments was not significantly different from those treated with bendiocarb, but after 13 weeks the trifluron-treated plants had the same degree of infestation as did the check. When S-31183 was applied to 1st instars only, more than 70% of the scales remained 1st instars one month post-treatment. Development of scales in the trifluron treatments did not differ significantly from the check. The residual effect of S-31183 and trifluron, when applied to egg-laying females on butternut squash, was a delay in development of 1st instars.

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