. Annual report of the New York State College of Agriculture at Cornell University and the Agricultural Experiment Station. New York State College of Agriculture; Cornell University. Agricultural Experiment Station; Agriculture -- New York (State). Investigation of Scarring of Fruit by Apple Redbugs 189. ^» Certain varieties of apples are more subject to fatal injury than are others. Apples that grow to a large size, such as the Twenty Ounce and pippin varieties, develop rapidly and can withstand or recover from wounds that cause a slow-growing variety to. drop. The Northern Spy is a variety t
. Annual report of the New York State College of Agriculture at Cornell University and the Agricultural Experiment Station. New York State College of Agriculture; Cornell University. Agricultural Experiment Station; Agriculture -- New York (State). Investigation of Scarring of Fruit by Apple Redbugs 189. ^» Certain varieties of apples are more subject to fatal injury than are others. Apples that grow to a large size, such as the Twenty Ounce and pippin varieties, develop rapidly and can withstand or recover from wounds that cause a slow-growing variety to. drop. The Northern Spy is a variety that develops slowly fol- lowing the set of the fruit, and thus the injured fruits are more likely to drop. Vitality in the development of the fruit is particularly noticeable in pippin and Twenty Ounce apples in- jured by the larvae of the fruit-tree leaf-roller. These fruits may have part of the core eaten out and still develop to maturity, showing the Fig. 24. mature northern spy apple remains of the core tissue at the SSrp"^?^/^™^"™^""'''" bottom of the wound. If the core of the young apple is punctured by feeding redbugs, the flesh of the fruit never grows back at the point of puncture and a deep pit results in the mature apple (figs. 23 and 24). Later, when the fruit is of such size that the insect is unable to reach the core, the flesh will develop be- neath the point of puncture and tend to reduce the depth of the pit. When the growth is sufficiently rapid the pit may dis- appear entirely and a spreading russet, scar take its place. After the apples have reached more than a quarter of an inch in Fig. 25. YOUNG northern spy apples (july 8) showing diameter, growth is THE splitting AND SPREADING SCARS THAT DEVELOP FROM , • j -i .1 PUNCTURES MADE BY REDBUGS vcry rapiQ, anQ tne punctures made by the redbugs cause a splitting of the fruit skin which continues to enlarge with the growth of the apple until broad russet scars result (figs. 25 299.
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