20 



HOW TO CONTROL THE PEAR THRIPS, 



must be held close to the bud clusters to force the spraij directly into 

 the ends of the huds. This is absolutely necessary to secure good 

 penetration and get satisfactory results. Plenty of material — 3 to 5 

 gallons per tree for pears, de])ending on the size of the tree — shoidd be 

 used; more liquid is required for large prune trees; large cherry trees 

 may require 7 to 8 gallons per tree for satisfactory results. Only two 

 rows should be sprayed at a time, using three men, one on the tower 

 to spray the tops of the trees, thus reaching all buds pointing iqnvard, 

 and two men on the ground (one to each row) to spray the lower 

 buds and those pointing downward or laterally. 



Fig. U. 



-Power outfit ready for use in spraying e.xperinients in pear orchards, Contra Costa County, 

 Cal., 1910. (Orifjinal.) 



TIMING THE APPLICATIONS. 



The spraying must be done on time, and for best results all the trees 

 should be treated within a few days. During the season of 1910 more 

 of the failure to get satisfactory results was due to lateness of applica- 

 tion than to any other one cause. Thrips w^ere in the trees and in 

 great numbers before many of the growers purchased their spraying 

 supplies, and in many cases half the buds were entirely destroyed and 

 the others badly injured before the trees had been given even the first 

 application. The grower should have everything in readiness, all 

 materials on hand, concentrated emulsion made up, and spray machin- 

 ery in perfect working order by the first of ^larch and have all other 

 orchard work in such shape that when the thrips appear in numbers 



