. Manual of fruit diseases . Fruit. 440 MANUAL OF FRUIT DISEASES the leaf or the fruit and produces infection during the rain, not before nor after. Get the fungicide on ahead of the rain and thus ahead of the fungus. Watch the weather maps and the develop- ing blossoms. It will be more prof- itable in some cases to spray a little before the host is in just the right condition in order to get in ahead of a rain- period. Long, rainy, cloudy periods are the dangerous ones. Heavy showers followed by rapid clearing seldom afford conditions favorable to serious infection by orchard fungi. The perio
. Manual of fruit diseases . Fruit. 440 MANUAL OF FRUIT DISEASES the leaf or the fruit and produces infection during the rain, not before nor after. Get the fungicide on ahead of the rain and thus ahead of the fungus. Watch the weather maps and the develop- ing blossoms. It will be more prof- itable in some cases to spray a little before the host is in just the right condition in order to get in ahead of a rain- period. Long, rainy, cloudy periods are the dangerous ones. Heavy showers followed by rapid clearing seldom afford conditions favorable to serious infection by orchard fungi. The period for effective applications of fungicides, in practi- cally all cases, is a brief one; at most a few days, more often only a day or two. This means that equipment, labor and materials necessary to cover the trees in a short time must be provided. The continuous running of one sprayer in a large orchard throughout the season is largely a loss of time and money. Fungicides to be effective must be applied at just the right time. Thoroughness is secorld only to timeliness as a factor in determining the success of spraying or dusting operations. Since fungicides are applied to protect, every part of the sus- ceptible surface must be covered. In spraying this cannot be. Fig. 125. — Apple-blossoms in proper stage for the first application of a Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Hesler, L. R. (Lexemuel Ray); Whetzel, Herbert Hice, 1877-1944. New York : Macmillan
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