. Better fruit. Fruit-culture. Page 40 BETTER FRUIT June ORCHARD SPRAYS AND SPRAYING SUCCESSFULLY KNOWLEDGE of a multiplicity of spra3's is not essential to success in spraying. Equipped with an understanding of the range of usefulness of three or four standard sprays, with a determination to do thorough work, one is as well fortified as may be against orchard pests and diseases. While it is true that most growers of experience understand the general theory of spraying it is considered desir- able for the benefit of the novice to emphasize certain fundamental princi- ples, a knowledge of which
. Better fruit. Fruit-culture. Page 40 BETTER FRUIT June ORCHARD SPRAYS AND SPRAYING SUCCESSFULLY KNOWLEDGE of a multiplicity of spra3's is not essential to success in spraying. Equipped with an understanding of the range of usefulness of three or four standard sprays, with a determination to do thorough work, one is as well fortified as may be against orchard pests and diseases. While it is true that most growers of experience understand the general theory of spraying it is considered desir- able for the benefit of the novice to emphasize certain fundamental princi- ples, a knowledge of which is essential to the proper selection and use of reme- dies for orchard diseases or insect pests. It should first be thoroughly under- stood that spraying is not a cure all. There are many diseases and some insect troubles of the orchard for which spray- ing is of no value, either as a preventive or cure. Fortunately most of the important orchard pests and diseases may be held under control by proper spraying. It is important to note, however, that in order to do effective spraying against any pest it is essential that the proper spray be used at the proper time for that particu- lar pest. A. spray which is effective against one pest may be totally ineffec- BY A. B. CORDLEY AND live against another, even if applied at the proper time. The proper spray for any pest applied at the wrong time is as useless as no spraying at all. It is, therefore, of prime importance that every grower should know what diseases and insects are prevalent in his district, that he be able to recognize them when he sees them and practice the proper methods of control. The proper time at which a spray should be applied and the proper spray to be used is determined by the life his- tory of the organism causing the trouble, whether it be an insect or a fungus, or bacterial disease. It is not the purpose at this time to discuss the life history of orchard pests, but rather to give general direc-
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