Bulletin Volume 115, Pts. 1-3 (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1915 Excerpt: ...is retarded. The present records on the number of molts of the codling moth in Michigan and in the Ozarks corroborate Edwards's statement. Jenne found seven instars in the South, while in the North the writer found six instars. CANNIBALISM AMONG LARVAE OF THE CODLING MOTH. In confinement, when a large number of mature codling moth larvae are kept together, it sometimes happens that certain larvae will attack and kill weaker ones and later devour them. After such a feast the cannibal larva assumes a dull, turbid color and can be readily recognized from the rest. It is evident that cannibalism among the larvae also takes place under normal conditions. It has frequently been noted that a number of newly hatched larvae have entered the same apple, but only a single or a few larvae matured in the same fruit. Occasionally larvae have been collected from bands which had the characteristic appearance of cannibal larvae. CODLING MOTH LARVAE REMAINING TWO SEASONS IN THE LARVAL STAGE. An unusual observation on the duration of the larval stage of the codling moth was made in 1909 and 1910 by Mr. R. W. Braucher at Douglas, Mich. In the fall of 1908 a number of larvae were collected for rearing purposes and for studies to be made the following spring. Two of the larvae failed to transform in 1909 and both were alive the following spring, 1910. On April 30 one larva had pupated; the other larva died June 24. The pupa, too, finally failed and was found dead July 18. Considering that the larva left the fruit about September 1,1908, or possibly much earlier, we find that one of the insects remained 20 months in the larval stage without taking food or water and that the other specimen remained 23 months in the cocoon as larva and pupa. The two larvae had made their cocoons in...