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(1) Locate virus-free stock aiid plant beds in places isolated from possible 

 £>ources of apliids and virus - 3000 ft, is suggested as a reasonably safe 

 distance - any distance is better than none. Distance in itself does 

 not guarantee immunity to aphids and virus — but isolatxon is helpful. 



Winged aphids result when a strawberry aphid colony reproduces rapidly and 

 becomes overcrowded. They occur principally during May and June and again in 

 September, October and November, Soine may be found during summer months also, 

 therefore ; 



(2) Dust all new and old plantings at 10-lU day: intervals after growth 

 starts in April and during May and June (except during bloom and within 

 2 weeks of harvest on fruiting beds). 



(3) Dust all plantings at 3- to It-week intervals during July and August, 

 (U) Dust all plantings at IO-IJ4 day intervals during September and October, 



Materials 



Strawberry aphids occur in the buds or on the undersides of the foliage. 

 Dusts have proved superior to sprays in tests so far although this may not hold true 

 under all conditions. Materials must be driven into the buds and under the foliage, 



(5) Parathion-15? dust is recommended widely. Observe all safety precautions, 

 with this material , 



(6) Malathion k-Sfo dust should provide as good control; it will cost more 

 but is safer to use. 



Equipment 



Hand dusters are not adequate on any. but the smallest plantings. Power 

 dusters should have nozzles arranged so as to drive the dust into the buds and under 

 the foliage, A canvas apron to confine the dust increases effectiveness* 



«— Yii',H,Vi[heeler 



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Publication approved by George J, Cronin, State Purchasing Agent — #19 



