Table 1. Schedule of insecticide treatments for the control of 

 pear psylla on pears. Spring Hill Orchard, CT. 1979. 



ab 

 Treatment programs Dosage/100 gals. Dates applied 



A. Superior oil 3 gals. 4/12, 4/23,5/18, 



6/15, 6/29 



B. Superior oil pre-bloom; 3 gals. 



fenvalerate 2.4EC 10.7 fl. oz. 4/12, 4/23, 



(Pydrin) starting at 5/3, 5/18 



white bud stage 



C. Superior oil pre-bloom; 3 gals. 4/12, 4/23,5/3, 



phosalone SEC (Zolone) 1.7 pts. 5/18, 6/4, 6/15, 



starting at white bud 6/29 



stage 



D. Fenvalerate 2.4EC 10.7 f 1 . ozs. 5/3, 5/18 



(Pydrin) 



E. Superior oil pre-bloom; 3 gals. 4/12, 4/23, 5/18 



fenvalerate 2.4EC (Pydrin) 10.7 f 1 . ozs. 

 starting at petal fall 



P. Check (untreated) 



a 



All treatments, with the exception of the check (F) received one 

 application of az inphosmethyl (Guthion) on 5/18 at the rate of 

 10 ozs./lOO gals., and one application of amitraz (BAAM) on 7/31 

 at the rate of 2 pts./lOO gals. 



b 

 All insecticides applied dilute to runoff by handgun. 



Damage ratings are presented in Table 2. Percent clean fruit 

 was highest (94, 94 and 92%) in treatment programs using fenvalerate 

 (Pydrin) either alone (Treatment Program D) or in conjunction with 

 pre-bloom oil treatments (B and E) . Oil used alone (A) or in con- 

 junction with phosalone (Zolone) (C) resulted in 75 and 88% clean 

 fruit, respectively. Few (61) clean fruits were found on check 

 trees (F) . Limb and leaf contamination ratings corresponded well 

 with the percent clean fruit findings. 



