. Better fruit. Fruit-culture. April. 1920 BETTER FRUIT Page 7 Dusting and the Spray Gun in Calyx Worm Control EVER since the late Dr. A. J. Cook carried on some calyx worm con- trol experiments in Michigan a half century ago entomologists have argued relative to the way and in the amounts this poison becomes estab- lished in the calyx cups. The correct type of nozzle and the kind of spray necessary to accomplish best results have been a much mooted question. In this connection some of our more en- thusiastic colleagues have even gone so far as to believe that one well-timed calyx application
. Better fruit. Fruit-culture. April. 1920 BETTER FRUIT Page 7 Dusting and the Spray Gun in Calyx Worm Control EVER since the late Dr. A. J. Cook carried on some calyx worm con- trol experiments in Michigan a half century ago entomologists have argued relative to the way and in the amounts this poison becomes estab- lished in the calyx cups. The correct type of nozzle and the kind of spray necessary to accomplish best results have been a much mooted question. In this connection some of our more en- thusiastic colleagues have even gone so far as to believe that one well-timed calyx application would be sufTicient to handle the codling moth under ordinary seasons of infestation. Observations made by investigators in different parts of the country during recent years have pointed out that the percentage of calyx entrants is a very variable factor during different sea- sons in different .sections. It has been the writer's observation that during some seasons a very high percentage of the worms enter through the calyx and during others the reverse would be true. During the past season the worms en- tered in about equal proportions through the calyx and side on Spitzen- bergs, while in Newtowns, side en- trants occurred in a much larger pro- portion. From information that I have received from various sources a condi- tion of this sort was quite general throughout the Northwest during the past year. It is not ray purpose to in any way depreciate the importance of the calyx application in the minds of orchardists. The more stress that we can lay upon this and the cover sprays the better will be the results. However, over- emphasis of the calyx application has been harmful in that it has had a tend- ency to depreciate (in the minds of the growers) the value of cover sprays and much worminess has been the result. The writer has been keeping in very close touch with codling moth activities in Hood River for six years. During the past four years experimental work with dust and
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