356 Report ok thk DicPAin.Mi'.XT ok ExTo^roLOf;v ok thk 



were boginning to turn brownish or blackish. On May 1st the 

 destructive effects of the thrips' work seemed to be the most con- 

 spicuous. The trees most seriously injured were wet with sap 

 which ran down the fruit spurs, discoloring the bark of the large 

 branches, while bud scales, leaf stipules, blossom bracts, sepals of 

 unopened blossoms and margins of leaves were blackish or dis- 

 colored. On May 9 KiefPers were in full bloom, and there was 

 a marked contrast between the healthy and aifected trees because 

 those that were much injured appeared as if struck by blight. On 

 fruit spurs there were dead buds and many brownish shriveled 

 blossom clusters, while the leaves were small and cup-like with 

 blackened margins. During blossoming the larvae appeared, in- 

 juring the tender leaves and causing them to be deformed. About 

 Germantown Kieffers suifercd the most and there was scarcely an 

 orchard of this variety that did not show evidences of the work of 

 the tlirips. While gome fruitgrowers lost a goodly percentage of 

 their crops, the thrips was not equally destructive in all orchards. 

 Its work was spotted and showed up more on some trees or in 

 some orchards than others. The reduction in fruit yields varied 

 apparently in proportion to the numbers of the thrips and the 

 severity of the attack. On the whole the Kieffer crop of 1011 

 was much more satisfactory than that of the preceding year. 

 Seckel orchards were oftentimes similarly injured while Bartletts 

 and Clapp Favorites, though showing considerable blighting of 

 blossom clusters in different plantings, were not in the main seri- 

 ously affected. The almost complete destruction of blossom clus- 

 ters was observed on trees of Beurre Bosc, Beurre Anjou, Ver- 

 mont Beauty, Dana Hovey, Clairgeau, Ehode Island and Vicar 

 of Wakefield. As these varieties are not grovm extensively the 

 losses to these crops were locally of comparatively little 

 importance. 



Apples were generally infested with thrips, but the destruction 

 of blossom clusters was not so common as with the pears. In 

 spite of the presence of large numbers of the thrips in the Ijuds 

 there was usually a large setting of apples. While all of the lead- 

 ing eonunercial varieties were more or less infested by the thrips, 



