HOW TO CONTROL THE PEAR THRIPS. 21 



the spraying may be done at once and before the buds have been 

 seriously injured by the feeding of the adults. The grower should 

 have enough spray machines to cover the orchard quickly. At least 

 one good power outfit is necessary for every 30 acres of orchard. 



SCHEDULE OF APPLICATIONS. 



In badly infested orchards three applications are necessary the 

 first year for controlling the pear thrips. Two of these sprayings 

 should be directed against the adults and one against the larvte, and 

 to obtain satisfactory results must be timed properly. 



First application. — The first spraying should come as soon as the 

 thrips can be found on the trees in numbers. This will usually be 

 the first two or three days of March, just as the earliest buds are 

 separating slightly at the tips. In figures 12, 13, and 14 are shown 

 photographs of the more advanced buds of Bartlett pear, Imperial 

 and French prunes, 

 and Black Tartarian 

 cherry, which were 

 taken at time of first 

 application. 



Second applica- 

 tion. — The second 

 spraying, whichis also 

 for adults, should 

 come from four to 

 ten days after the 

 first, dependingsome- 



what on VarietV of ■^'^" 12.— Bartlett pear cluster buds showing stage of earliest buds at 

 p . (."i 1 time of first spraying against thrips. (Original.) 



fruit, stage or bud 



development, and rapidit}' of emergence of thrips from the ground. 

 On pears this will usually be just as the earliest cluster buds are 

 spreading, and on prunes and cherries when the tips of the petals first 

 begin to show. 



Both of these applications are important and necessary to insure 

 the production of a good crop of uninjured blossoms. The nozzles 

 should be held close to the bud clusters and the spray directed into 

 the ends of the buds. This makes it necessary that the spraying be 

 done mostly from above. 



Third application. — The third spraying is for larvae and ])roperly 

 comes just as most of the petals are falling from the trees, de])entling 

 somewhat upon the variety of fruit. In any case the small, wliite, 

 active larvae can be easily seen, and when they first become abun- 

 dant spraying should be done. In this larval spraying on cherries 

 and prunes where there is a large amount of leaf surface exposed, the 



