Losses to cotton, what to look for and where to find it, being one of a series of articles in relation to crops, their common diseases and insect pests to which they are subject . erefore, have a fair chance to develop as longas squares are being formed. Whenever frost or other un-favorable weather causes the plants to cease putting onsquares, the weevils attack the bolls. The cotton boll weevil, so far as known at present,has no food plant other than cotton. In the fall when frosts occur, immature stages of de-velopment of the boll weevil may be found in the scjuares orbolls. Provided food su
Losses to cotton, what to look for and where to find it, being one of a series of articles in relation to crops, their common diseases and insect pests to which they are subject . erefore, have a fair chance to develop as longas squares are being formed. Whenever frost or other un-favorable weather causes the plants to cease putting onsquares, the weevils attack the bolls. The cotton boll weevil, so far as known at present,has no food plant other than cotton. In the fall when frosts occur, immature stages of de-velopment of the boll weevil may be found in the scjuares orbolls. Provided food supply is sufficient, many of theseimmature stages continue their development at a very slowrate and adults finally emerge. Thus there may be a some-what continuous ])roduction of adults during the winter. 10 Ordinarily, however, this is not conspicuously the case, sincethe frosts that destroy the cotton generally kill practicallyall of the immature stages of the weevil. The Cotton Boll Worm, or Com Ear Worm The boll worm is the common greenish or brownishworm that eats into the bolls of cotton and the ears of bothfield and sweet corn. Its eggs are usually laid in the top of. TRANSFORMATION OF COTTON BOLL WORM (1) Egg on underside of cotton leaf; (2) larva one-third grown boring into square; (3) entrance hole of young larva in square, with excremental pellets at edge of hole; (4) nearly full-grown larva just issued from boll; (5) full-grown larva on leaf stem; (6) pupa shown in center of underground earthen cell; cell shown in longitudinal section; (7) adult moth, light variety; (8) adult moth with light fore-wings; (9) adult moth in resting position, wings slightly elevated, hind border of hind wings slightly showing. the boll, and the young larva soon begins to feed, eatinginto the cotton at the tip of the boll. As it grows it tunnelsdown into the boll, burrowing only a part of the lock, yetinjuring the whole fiber. 1] The boll worm spends the winter in the pupa state inthe gro
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Keywords: ., bookcentury1900, bookdecade1910, bookidlossestocott, bookyear1919
