13 



Oyster-shell Scale {Oyster Back). 

 Spray thoroughly as soon as the young hatch (about June 1) 

 with kerosene emulsion (No. 4), stock 1 part, water 6 parts, and 

 repeat in ten days. Dead scales which remain all summer 

 after treatment do not indicate failm-e of the treatment. 



Plum Curculio. 

 The plum curculio feeds on young apple leaves and also 

 punctures the fruit, causing hard spots with woody places 

 inside them. Spray with arsenate of lead 3 pounds, water 50 

 gallons, after the leaves begin to develop, but before the blos- 

 soms open. Repeat after the blossoms fall, as for the codling 

 moth. Repeat three to four weeks later. Bordeaux mixture 

 can advantageously be combined with the arsenate of lead in 

 these treatments (No. 20). Jarring the trees about sunset, 

 beginning ten days after the blossoms fall, makes the insects 

 drop. Spread a white cloth over the ground before jarring the 

 trees, and destroy those insects which fall on it. Repeat this 

 once every week for about three weeks. 



Round-headed Borer. 



Look for "sawdust" at the base of the trunk in October and 

 trace this to cavities just imder the bark above, in which the 

 borers are, where they may be cut out and killed. Put wire 

 mosquito netting around the trunk in form of a cone, the lower 

 end entering the ground and the upper end close around the 

 trunk about 2 feet up, keeping the borers out and also pro- 

 tecting from mice and rabbits in winter. 



San Jose Scale. 



Spray thoroughly during the winter or spring, before the 

 buds open, with lime-sulfur wash (No. 7) or a miscible oil 

 (No. 9). Use a nozzle giving a misty spray. If badly infested, 

 spray before January with the lime-sulfur, and just before the 

 buds open with the oil. With one spraying each year it will 

 probably be better to alternate the lime-sulfur and the oil. 



