110 



STATE BOARD OF AGRICULTURE. 



very resistant. Strong caustic washes readily detroy the scurfy scale in winter, 

 scattering the eggs beneath them and causing their destruction ; but these same 

 washes have little effect against the oyster shell scale. 



\S. 



F 



Fig. 50.— Development ot an armored scale : a, active larva with lancets extended; 



b, somewhat contracted with waxy filaments ready to run together ; d, 



first scale just formed from above and side : all much enlarged. 



Aside from the winter treatments, the best rule to follow in dealing with scale 

 insects is : find out exactly when the active larvse are moving about and seeking 

 to fix themselves ; then at short intervals spray one, two or three times as may 

 be necessary with a somewhat weak mixture of soap, kerosene or tobacco, using 

 the material liberally so as to hit every crawling larva and kill all recent sets. 



Caustic mixtures act by corroding the scales ; oily mixtures by penetrating 

 beneath them : kerosene and fish oil soapsuds combines both types and should 

 be one of the most effective of our mixtures when its range is once properly 

 ascertained. 



Sub-family COCCIN^. 



DACTYLOPIUS Costa. 

 D. oitri Risso. A mealy bug; common in greenhouses 

 D. adonidum Linn. Mealy bug ; common in greenhouses. 



PHENACOCCUS Ckll. = PSEUDOCCOCUS Auct., not Westw. 



P. aceris Sign. Became suddenly common in New Brunswick and several 

 other New Jersey cities in 1895, but disappeared almost completely two 

 years later (Sm). Freehold (U. S. Ag.), Newark, Paterson. 





