102 



DECIDUOUS FEUIT INSECTS AND INSECTICIDES. 



tion against side worminess, but not so much as the demonstration, 

 which shows an increase in -side-entrance protection over the one- 

 spray method of 5.34 per cent. The unsprayed plat shows 56.60 

 per cent of wormy fruit, so there is a total saving of 55.87 per cent 

 of the crop by the demonstration treatment and 49.44 per cent by 

 the one-spray treatment. 



THE PLUM CURCULIO. 



The plum curculio was considerably in evidence in the Bancroft 

 orchard during 1911. The unsprayed plat (Table XIV) shows only 

 65.13 per cent free from curculio injury, while the demonstration plat 

 shows 90.37 per cent free from this insect as against 85.69 per cent 

 on the one-spray plat, the demonstration plat showing an increase 

 in sound fruit over the one-spray plat of 4.68. The difference in 

 favor of the demonstration plat was very probably influenced by the 

 location of the one-spray plat as previously mentioned under the 

 discussion of codling-moth injury. 



Table XIV. — Injury by the plum curculio for entire season. Plats II, VII, and VIII. 



Camden, Del., 1911. 



PLAT II. LIME-SULPHUR DEMONSTRATION. 



PLAT VII. ONE-SPRAY METHOD. 



Number of punctures 



Number of fruit punctured . 



Number of sound fruit 



Number of fruit 



Per cent free from injury. . . 



85.69 



PLAT VIII. UNSPRAYED. 



Number of punctures 



Number of fruit punctured . 



Number of sound fruit 



Number of fruit 



Per cent free from injury . . . 



EXPERIMENTS IN KANSAS. 



The experiments in Kansas during the season of 1911 were carried 

 out in the Thomas Fruit Farm orchard near Wichita, Kans. This is 

 a large orchard consisting of 76 acres, and is quite level. The soil is 

 a sandy-loam type and was not well cultivated during the season. 



