HOW TO CONTROL THE PEAR THRIPS. 



17 



drench all Inids pointin<^ upward which coukl not be properly sprayed 

 by the nien on the ground. 



Four trees in one side of this orchard, same variety, same age and 

 size, and all other conditions the same, were left unsprayed. 



Results. — ^AVithout a single exception all of the 550 sprayed trees 

 came uniformly into full bloom, while the trees left unsprayed showed 

 only very few scattering blossoms and these badly injured. Figure 9 



Fig. 9.— Swelt ])ciir uiuhard al lime of blooiuing. Sprayi 



(AflLT SWfU.) 



shows the condition of a sprayed tree at blossoming time. The 550 

 sprayed trees gave a yield of 1,700 boxes of No. 1 pears and 150 

 boxes of No. 2 pears. The No. 1 pears, at an average net price of 

 80 cents per box, gives $1,360, and the 150 boxes of No. 2 pears, at 

 50 cents per box, gives $75, making a total of $1,435, the value of the 

 crop from 550 sprayed trees, or practically $2.60 per tree. 



