MAINE AGRICULTURAI, i;xPE;RIMENT STATION. 9 



with Paris Green, Paris green was tried at different strengths. 

 Later when arsenate of lead was found to work satisfactorily 

 in gypsy moth control it was tried in orchard work. 



It was found that by use of arsenical spray 'before the buds 

 open that the injury from the bud moth was well controlled. 



It was found that by spraying only once after the petals fell 

 with an arsenical spray that the codling moth could be fairly 

 well controlled. With three arsenical sprays, one just before 

 the blossoms opened, one after the petals had fallen and another 

 about two weeks later the number of apples damaged by the 

 work of the codling moth is practically reduced to zero. 



It was found that the tent caterpillar can be controlled by one 

 arsenical spraying applied as soon as the eggs hatch. 



It was found that the forest tent caterpillar can be controlled 

 by one arsenical spraying applied as soon as the eggs hatch. 



It was found that the brown-tail moth caterpillar, the red- 

 humped caterpillar, the fall web worm, and the tiger moth cater- 

 pillars can be controlled by an August arsenical spray. 



It was found that because of the superior adhesive qualities 

 that arsenate of lead has more lasting effect than Paris Green. 



It was found that arsenate of lead injures foliage the least of 

 the arsenical compounds. 



SPRAYING FOR INSECTS THAT SUCK PLANT JUICES. 



The worst of these in Maine are the oyster shell bark scale, 

 the San Jose scale when present and the apple aphids. These 

 insects have been carefully studied and methods for their 

 control worked out in adequate experiments. For the San 

 Jose scale dormant winter sprays of lime sulphur are a sufficient 

 remedy. The oyster shell bark scale can be successfully con- 

 trolled by strong applications to the limbs they are infesting 

 during the months of the year when the trees are dormant and 

 without foliage. Strong washes that will kill the eggs in which 

 stage this insect winters under the protecting female scale insects 

 can be safely applied at that time without damage to the trees. 

 Strong soap washes, caustic washes and strong lime-sulphur 

 solutions can be safely used in the early spring months before 

 the buds swell. Washes are best applied with a large brush. 

 Strong lime sulphur can be applied with the spray pump. Even 



