| Show CHERRY LEAF BEETLE recommendations for control of periodical pest outbreak in 1915 was by far worst that fruit growers grower have yet experienced experts becom mend nicotine sulphate from the tha united states department of agriculture the appearance in enormous num bers apra of the cherry leaf beetle in the spring of 1015 necessitated ft a study of this insect the results of which have just been published by the department in a professional paper bulletin no the cherry leaf beetle A periodically od leally important insect enemy of cherries by it II A cushman and dwight isely the 1015 1915 outbreak was by far the worst that fruit growers have yet experienced that year the beetle proved destructive des alve throughout the greater part of new york pennsyl syl vanta vanla and northern west virginia and also in the northern part of lower michigan where cherry growing Is very extensive the entomologists who studied tho the insect at that time now recommend that for peach oid orchards nicotine sulphate be used an and for cherry trees sweetened arsenate of lead these are tho the only two cultivated traits fruits that the beetle attacks sweet cherry and plum are not in danger and the thicker leaved varieties of the sour cherry are much less seriously injured than the thin leaved kinds tha nicotine sulp sulphate liate used in the experiments consisted of a solution of 40 per cent nicotine sulphate sul 1 part to parts of water to which was added PC ush oll soap at the rate of 2 pounds tu to 50 gallons of liquid this spray does riot not bunse the tha same injury to peach foliage that Is likely to follow the use of strong mixtures of arsenate of lend lead it Is however only temporarily pora rily effective and an application one day does docs not prevent an invasion of the orchard on the following day for cherry trees arsenate ot of lead must be applied at a rate of not less than 5 6 pounds to 60 50 gallons of water the addition of molasses at the rate of 1 gallons to BO 50 gallons ot of the mixture makes the spray much more effective but on the other hand the add addition of tills this sweetening allows the spray to fo be more easily washed off by rains in favorable weather however the effect of the spray Is continuous As the beetles feed on the under side aide of the leaves care must be taken to cover tho thoe e with the poison spray in some instances instance it may be necessary to spray only young cherry trees or older trees of the thin leaved varieties |
