2G 



close together. On unsprayed trees 236 weevils were counted on 1650 

 leaves and on sprayed trees 40 weevils on 2300 leaves ; or .143 and .018 

 weevils per leaf respectively — a decrease of about 90 per cent, in the 

 number of weevils. 



The trees in this orchard were trimmed high and the soil was well 

 cultivated, hence there was nothing to interfere with the movement of 

 the canvases. In another orchard, however, in which the branches hung 

 low, many touching the ground, it was found entirely impracticable to 

 handle the canvases. However, satisfactory results should be obtained 

 with a TJ/S per cent, emulsion without the use of the canvas. 



Fig. 15. In spraying with some of the contact insecticides :i was found of 

 advantage to spread a canvas under the tree whiie tlie insecticide was 

 being applied. The fallen beetles were soaked by the liquid and death 

 was more likely to result. Tlie canvas was divided into two parts and an 

 edge of each was naijed to a strip of wood to facilitate handling. 



Dusting with nicotine. — The dust used in this experiment was one 

 containing IJ^ per cent, of free nicotine, and the application was made 

 with a large-size new model Niagara duster operating at full speed. The 

 work was done about 10 a. m. on a bright sunny day at a temperature 

 of about 70°. The overwintering beetles were feeding in abundance on 

 the newly developed foliage, and were doing noticeable damage. 



The application was ineffective, large sheets spread beneath the 

 dusted trees having on them no dead beetles after 10 hours, although 

 the disturbance caused by the operation had caused a considerable drop- 

 ping of beetles and many were covered with dust. Moreover, beetles 



