88 



DECIDUOUS FRUIT INSECTS AND INSECTICIDES. 



ject has been published by other workers, notably by Prof. W. E. 

 Rumsey, in West Virginia Experiment Station Bulletin 127, and 

 by Dr. E. P. Felt, in Circular 40 of the New York State Department 

 of Agriculture and in the Journal of Economic Entomology for 1911 

 and for 1912. The information now available seems to warrant the 

 conclusions given in the present paper. 



EXPERIMENTS IN VIRGINIA. 



The experiments in Virginia were carried out during the season 

 of 1910 in the orchard of Mr. W. F. Gilkeson near Fishersville. The 

 entire orchard consists of 30 acres, but only about three-fourths of 

 this was used for the experiments, the remainder being sprayed by 

 the owner. The experimental part comprised three plats, as shown 



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Fig. 23. — Diagram showing arrangement of plats and trees in the W. F. 

 ville, Va. Trees counted are indicated by circles, the numbers agreeing 

 tables. Variety, York Imperial. (Original.) 



Gilkeson orchard, near Fishers- 

 with the numbers of trees in the 



in the accompanying diagram (fig. 23). The trees of each plat from 

 which the fruit was counted throughout the season for records are 

 designated in the diagram by the same numbers which these trees 

 bear in the table. The orchard is on a hillside gradually sloping to 

 the southeast. It had a good cover crop of June grass and clover 

 and was kept clean of dead limbs and rubbish, and the trees are 

 headed rather low, thus facilitating spraying. The principal variety 

 is York Imperial. There are a few Early Harvest trees scattered 

 throughout the orchard, but none of these latter was included among 

 the count trees. Plat I included 150 trees, Plat II 64 trees, and 

 Plat III (the unsprayed plat) 10 trees, this last plat being in the 

 center of the orchard. The treatments which the respective plats 

 received are shown in Table I. 



