. 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). I go Bulletin 396 and 26). Wounds made later in the season do not heal so readily as do those made while the fruit is expanding by rapid growth early in the season. Wounds made after the middle of July never heal with a clean scar, but become covered with a thick, corky layer formed by the dead and dried cells of the fruit. In the case of these late
. 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). I go Bulletin 396 and 26). Wounds made later in the season do not heal so readily as do those made while the fruit is expanding by rapid growth early in the season. Wounds made after the middle of July never heal with a clean scar, but become covered with a thick, corky layer formed by the dead and dried cells of the fruit. In the case of these later injuries, which are usually produced by the tussock moth or the plum curculio, the matur- ing date of the variety has much to do with the heal- ing of the wound. Early- maturing varieties do not heal the wounds made after ? growth is nearly completed, Fig. 26. MATURE NORTHERN SPY APPLE SHOWING THE g^^^^ [-^ many cascs brown IRREGULAR RUSSET SCARS THAT DEVELOP FROM RED- BUG PUNCTURES SHOWN IN FIGURE 25 TOt DEVELOPMENT OF LYGIDEA MENDAX IN RELATION TO THE GROWTH OF THE TREE AND THE FRUIT The nymphs of Lygidea mendax begin hatching just as the blossom buds separate at the tips, and most of them have entered the second instar by the time the blossom buds show pink and are ready for the first scab spray. The nymphs are in the third instar while the trees are in bloom, and most have entered the fourth stage by the time the petals have fallen. It is during the fourth and fifth instars that the greatest amount of damage is done, or from the time when the petals fall to the time when the young apples are one-half inch in diameter. In 1914, which was a normal growing season, the adults of L. mendax were maturing rapidly by June 18, and practically all were mature by June 22. The adults feed on the fruits extensively for a week or more, and then, as the fruits get larger and tough, they begin feeding more on the tender shoots that develop. INJURIES CAUSED BY LYGIDEA MENDAX Whe
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