New Materials for the Control of the Apple Rust Mite1

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Abstract
The apple rust mite, Vasates schlechtendali (Nalepa), was effectively controlled by pre-bloom applications of Thiodan® (6,7,8,9, 10,10-hexachloro-1 ,5,5a,6,9,9a-hcxahydro-6, 9-methano-2,4,3-beuzodioxathicpin-3-oxide), Eradex® (2,3-quinoxalinedithiol cyclic trithiocarbonate), and NIA-9044 (2-(2-butyl)-4,6-dinitrophenyl 3,3-dimethylacrylate). Applications of Thiodan, OW-9 (2 [2-(p-tert butylphenoxy )-isopropoxy] isopropyl 2-chloroethy1 sulfite), and Sevin® (1-naphthyl N-methylcarbamate) during the summer gave control lasting 4 weeks. However, applications o Sevin at n dosage as low as 0.5 pound of .50% wettable powder per 100 gallons of water resulted in an increase in numbers of the McDaniel spider mite, Tetranychus mcdanieli McGregor, over those found on the unsprayed check plot.: Preliminary tests with Bayer 37344 (4-(methylthio)-3,5-xylyl methylearbamate), Bayer 39007 (o-isopropoxyphenyl methylcarbamate), and Zectran® (4-dimethylamino-3,5-xylyl methylcarbamate) indicated that these carbamates were effective for apple rust mite control.

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