Holding the winter Howage until after the middle of May seems 

 to be effective against this insect, but whether the water accomplishes 

 this result by keeping the moths from laying their eggs in the spring 

 or by destroying the vitality of eggs which have passed the winter 

 under the water it is impossible to state. 



Extensive spraying operations, with arsenate of lead used at the 

 rate of 5 to lo pounds per fifty gallons of water, against this insect 

 have been observed and the results carefully noted. In no case was 

 the spraying attempted until the worms were from a third to half 

 grown, and the results were all poor. Further, laboratory experiments 

 showed that these caterpillars will stand a considerable amount of 

 poison without being affected. As the new growth, on which they 

 feed mainly, is very smooth and is developing rapidly during the 

 time they are at work, it is not likely that enough poison could ever 

 be made to adhere to the vines to make spraying for this insect a 

 satisfactory method of treatment when the worms are at all well along 

 in growth, and it is even doubtful if it would pay. 



Contact poisons have been experimented with to some extent, but 

 in no case with successful results. 



It seems probable that spraying with arsenate of lead will be found 

 to be most effective against this insect, if done when the worms are 

 very young and before the new growth has developed to any extent. 

 The chances of success, at this time, should be greater, because the 

 leaves at the tips of the old uprights are standing up so as to form a 

 sort of a cup which will hold the spray until the poison can dry down 

 on the bud. Then, too, the worms at this stage can probably be 

 killed with a proportionally small amount of poison. Of course, the 

 earlier the caterpillars are destroyed the greater will be the injury 

 averted. 



Recommendations for treatment : — 



tLm On bogs with abundant water supply for reflowage : — 



I . Examine the bogs carefully from time to time, from May ist to 

 May ijth. If any caterpillars appear, refow for twentyfoiif to thirty- 

 six hours as soon after May i^th as practicable. Jf the young cater- 

 pillars are present in abundance, this will save a great amount of injury 

 to the buds. Furthermore, less difficulty loill be experieticed at this time 

 with worms which sunnve the Hooding and are washed ashore alive. 



