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Show SPRAY NOW FOR CLEAN APPLE : CROP, ADVISES A. C. EXPERT 5 trated the fruit without being killed. Where modem washing equipment is available, a combination of oil and lead arsenate should be most effective. One gallon of medium oil emulsion (viscosity 65 to 75, sulf'on-ation sulf'on-ation test 85 per cent) and A pounds f lead arsenate is suggested for each 100 gallons of spray. Where such equipment can not be had, a conrbination of oil and nice tine can be used to avoid spray residue. res-idue. This combination has not been as well tested as the oil and lead, but has been found imperior to lead alone in tests in Washington state. It must be carefully timed to destroy the maximum number of eggs. One gallon of oil (similar to above) with pint of nicotine sulphate per 100 gallons of spray is the amount required. Growers who use this spray as a substitute for arsenate of lead are warned that its efficiency has not been tested under Utah conditions. The second application for second brood "worms' should normally be "made in about throe weeeks, or about August 10, unless data from ihe "hootch pots" make a change of dates desirable. If three cover-sprays cover-sprays are to be used, they shout:' be two weeks apart. . Counts in the test ploU of Ogden indicate satisfactory control of the first brood where two " or three cover sprays, including one of oil and lead, were used. 1J.V F. M. C'OE Hah Agricultural Experiment Sta. Second brood codling moth eggs ire now liBtclnng tp. ihe apple oi'ch-irds oi'ch-irds in large numbers Growers who have not done so in the past week should spray now to protect their crops from worms, particularly particular-ly the lale fall and winter apples, ;ince the second brood is the one .vhich do.s most of the damagf. Those reco-.-.inendations ar e based Dn the numbers of adult moths alight in the "hootch pot" traps in tho Croft orchard in Weber county by District Agricultural Inspector Leroy Marsh of Ogden. The first emergence of adults (which lay eggs hatching into larvae of the second brood) in considerable numbers num-bers was on July 16. Allowing six i'.ays for the eggs to hatch, the first eggs should now be hatching and j ihe worms entering the fruit. Hence 1 the recommendation to spray as soon as possible. Trap rU'cor'a The mot:: trap recor d lor the past ten days is as follows: Codling moths caugirt in "hootch pot" traps: No. moths in July Temp. Trap: 11 90 0 12 tiS 1 13 70 G 1-4 71 1 15 70 27 10 71 85 17 70 42 j 18 -73 03 11) 71 59 20 70 i 72 ! Heavy egg laying began. With practicalry s:.x weeks of continuous hatching of larvae facing fac-ing us because of the earlrness of the season, at least two sprays more will be necessary in most cases to control this second brood and finish fin-ish the season with minimum loss from this, our worst fruit insect pest. With particularly valuable crops, poor control of first brood worms, severe damage last year, or prolonged hot weather (codling4 moths will emerge and lay when the temper ature exceeds '60" degree F. in the evening), a third application applica-tion may be advisable. Arsenate of lead alone, heretofore the standard material, has been found relatively inefficient for sec-end sec-end brood control. Approximately half of the larvae placed experimentally experi-mentally on apples so sprayed pen- |
