Wisconsin State Horticultural Society / Annual report of the Wisconsin State Horticultural Society for the year ending July 1, 1921
Vol. LI (1921)
Grant, Paul E.
Spraying apples, pp. 92-94 PDF (747.0 KB)
WIScoNsIN STATE HORTICULTURAL SocIETY 93 The trees in our bearing orchard previous to 1919 had not been sprayed. There consequently was some roughened bark to be cleaned up-no scab. This would have been worked off gradu- ally in the course of the regular management, but this last summer we had a very bad blight infection, which was brought in by bees from neighboring farm orchards. The farm orchards are typical throughout the state,-planted by people who know nothing of raising fruit, and who are too busy with their general farm work to give them the needed and timely attention they must have. They are a menace, and a serious one, and something should be done promptly, to provide for their care or removal. Blight of apple trees is as insidious as cancer in the human being, and calls for drastic and prompt action. Along with the roughened bark condition and blight, we have a visitation of grain aphis. We want to catch as many of them as possible. We therefore shall put in a delayed dormant spray when the buds are swelling and aphis beginning to hatch. This delayed dormant spray will be followed by the pre-pink when the clusters show color, but before the pedicels have sprouted, adding nicotine sulphate, if presence of aphis justify. This is followed by the regular pink spray,-when the blossom buds are well separated in the cluster, just before opening. I believe this is the fruit spray recommended for this state aside from a dormant. This past season, with us, development from pre-pink to full bloom took place practically over night. Owing to weather con- ditions, clusters held in the pre-pink stage longer than usual, and then, with a warm wave, burst into full bloom. This may not occur again for some time,-again it may. If you are raising apples on any scale, you can hardly afford to take the chances. With a small acreage to get over,-one that you can cover in a day, it probably would not be necessary or advisable to apply this pre-pink spray unless you wish to grow top-notch apples-but, with a larger acreage, we do not feel safe in omitting this spray. Following the "pink" comes the "caylx"-just as the last petals are falling and before the caylx closes on the main bud of each cluster.
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