- 14 



VVc also tested a new material, Dimilin^'" for control of ABLM, Dimilin is 

 a chitin syntht sis inhibitor which acts against both ABLM adults and eggs. 

 Dimilin has lonj; residual activity and is reported to be non-toxic to beneficial 

 predators, reducing the risk of mite and aphid build-up associated with the use 

 of synthetic pyrethroids [see Fruit Notes 51(2):6-8]. A single application of 

 Dimilin (4 oz./lOO gal.) was very effective in controlling ABLM when applied at 

 tight cluster (Table 3), as was Vydate"*" (1.5 pt./lOO gal.) applied at early pink. 

 ABLM mine densities in the treated trees remained well below treatment 

 thresholds through the second generation. 



Table 3. Influence of pre-bloom application of Dimilin'"^ and Vydate "^ on 

 ABLM densities in three commercial orchards. 



1st Generation 2nd Generation 



Treatment mines per leaf mines per leaf 



Dimilin at TC 0.04 a* 0.08 a 



Vydate at EPK 0.02 a 0. i? b 



Untreated 0.26 b 0.60 c 



*Means within a column not followed by the same better are significantly 

 different at the 5% level. 



We also tested Dimilin for control of 2"*^ generation ABLM (Table 4), 

 applying a single treatment at 2"fl cover in one orchard, ard two treatments (at 

 2nd oover and 19 days later) in another orchard. Our results showed significant 

 reductions in ABLM larval densities in treated trees in both orchards. 



Table 4. Influence of a single application of Dimilin (Block 1) at 2nd cover 

 (2C) and two applications of Dimilin (Block 2), one at 2nd cover and the 

 second 19 days later, on ABLM densities. 



2nd Generation 

 Treatment mines per leaf 



Block 1: Dimilin at 2C 



Untreated 0.81 b 



Block 2: Dimilin at 2C + 



19 days later 0.05 a 



Untreated 0.60 b 



*Means within a column not followed by the same letter are significantly 

 different at the 5% level. 



Our results with Dimilin agree vvith results from other states and Europe. 

 Hopefully, Dimilin will be available for use in the near future. 



