102 



DECIDUOUS FRUIT 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. 



Number of punctured and sound apples, etc., per tree. 



Total 

 for plat. 



Total 

 per cent 





Tree 1. 



Tree 2. 



Tree 3. 



Tree 4. 



Trees. 



Tree 6. 



of fruit 

 free from 

 injury. 



Number of punctures 



641 



384 



3,298 



3,682 



89.57 



265 



169 



2,238 



2,407 



92.97 



440 



337 



3,435 



3,772 



91.06 



281 



204 



2,500 



2,704 



92.45 



821 



576 



4,201 



4,777 



87.94 



374 



261 



2,465 



2,726 



90.42 



2,822 



1,931 



18, 137 



20,068 





Number of fruit punctured 













Per cent free from injury 



90.37 









PLAT VII. ONE-SPRAY METHOD. 



Number of punctures 



Number of fruit punctured. 



Number of sound fruit 



Number of fruit 



Per cent free from injury. . . 



710 



458 

 2,106 

 2,564 

 82.13 



349 

 252 



1,842 

 2,094 



614 



417 



2,400 



2,817 



85.19 



784 



606 



3,918 



4,524 



86.60 



548 



444 



2,649 



3,093 



85.64 



779 



425 



2,667 



3,092 



86.25 



3,784 

 2,602 

 15, 582 

 18,184 



85.69 



PLAT VIII. UNSPRAYED. 



Number of punctures 



Number of fruit punctured. 



Number of sound fruit 



Number of fruit 



Per cent free from injury . . . 



1,322 



902 



2,566 



3,468 



2,602 

 1,599 

 3,299 

 4,898 

 67.35 



1,700 

 1,114 

 2,107 

 3,221 

 65.41 



1,599 

 8S9 

 1,834 

 2,723 

 67.34 



2,964 

 1,712 

 2,431 

 4,143 

 58.67 



1,898 

 1,041 

 1,320 

 2,361 

 55.90 



12,085 



7,257 



13,557 



20,814 



65.13 



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. 



