100 gallons. The same material at 

 a 2 lb. dosage was as effective as 

 parathion ( 15 per cent wettable 

 powder) at IV2 lbs. The results indi- 

 cated that Rothane shows little prom- 

 ise of being effective against the plum 

 curculio. In 1950 a combination of 

 methoxychlor-lead arsenate, and 

 methoxychlor alone gave a better 

 control of the plum curculio than did 

 the standard lead arsenate-DDT 

 combination. Parathion plus carbon 

 safener was slightly superior to para- 

 thion alone. 



Control of Cucumber Beetles On 

 Pickling Cucumbers and Winter Squash 



A dust comprising 6 per cent Mar- 

 late and 10 per cent Zerlate was 

 slightly inferior to the standards 

 C-O-C-S cucurbit dust in controlling 

 cucumber beetles on pickling cucum- 

 bers, but gave superior results when 

 used on turban squash. Yield in this 

 case was increased by approximately 

 one-half ton per acre. 



J. G. CONKLIN 



R. L. Blickle 



Synergists for Insecticides 



During the years 1949 and 1950 

 various chemical compounds were 

 tested as synergists for pyrethrum, 

 nicotine, and rotenone. These tests 

 were a continuation of studies made 

 in previous years. No new com- 

 pounds showed slight synergistic 

 action when used with nicotine but 

 not to a degree sufficient to warrant 

 further exploration. 



The hexahydrophthalates and cell- 

 osolves showed synergistic action 

 with rotenone when used against 

 aphids and house flies. 



A satisfactory solution, of roten- 

 one for use against houseflies was 

 accomplished with isopropyl alcohol, 

 "Indasolvent", and kerosene. The 

 problem of obtaining a solution of 

 rotenone for use with house flies 

 eliminated one of the main stumbling 

 blocks in testing synergists against 

 house flies. 



R. L. Blickle 

 W. J. Morse 



Forestry 



Bark Removal from Cut Logs 



Sample logs of poplar, birch, 

 maple, hemlock, spruce and fir were 

 cut and scored in several ways to 

 promote bark loosening. 



Scoring the bark was done by saw- 

 ing, knife cutting, and ripping. It 

 was found that a portable power cir- 

 cular saw could easily be used to 

 make a length-wise cut through the 

 bark and into the wood. A linoleum 

 knife was useful in slitting the bark. 

 A pulp hook had more ripping action 

 than the other two and did a satis- 

 factory job of scoring. 



Results one year after cutting 

 showed that in the case of red maple 

 and balsam fir the bark was com- 



pletely loosened. On paper birch it 

 was loose several inches from the 

 slit but tight otherwise. 



Very little bark loosening has oc- 

 curred on the other species. 



The season of cutting appears to 

 influence the degree of bark loosen- 

 ing, as red maple cut and scored dur- 

 ing the growing season has a much 

 higher percentage of loose bark one 

 year later than that of logs of the 

 same species cut and scored in the 

 Fall. 



L. C. Swain 



Thinning White Pine Plantations 

 By Bark Peeling 



In order to maintain growth and 

 quality in white pine plantations, it 



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