Manual of vegetable-garden insects . ce of the beetle and in its lifehistory. It is a troublesome pest in Europe, northern Africa,Syria and Persia and has been recently introduced intoCalifornia. By preference it attacks the European broadbean or horse bean but will also breed inpeas and certain species of vetch. In Cali-fornia the weevils appear in the field bythe last of March. The beetle closely re-sembles the pea weevil, both in form andmarkings. The latter are, however, morediffuse and the black spots at the tip ofthe abdomen are indistinct or lacking alto-gether (Fig. 44). The tooth on t
Manual of vegetable-garden insects . ce of the beetle and in its lifehistory. It is a troublesome pest in Europe, northern Africa,Syria and Persia and has been recently introduced intoCalifornia. By preference it attacks the European broadbean or horse bean but will also breed inpeas and certain species of vetch. In Cali-fornia the weevils appear in the field bythe last of March. The beetle closely re-sembles the pea weevil, both in form andmarkings. The latter are, however, morediffuse and the black spots at the tip ofthe abdomen are indistinct or lacking alto-gether (Fig. 44). The tooth on the under-side of the hind femur is more obtuse thanin the pea weevil. The female depositsher eggs on the outside of the bean pods, as many asthirty-four having been found on a single pod. The eggsare attached by a mass of sticky material. The egg iselongate-ovate, white to greenish yellow, smooth, a little over^ inch in length and about one half as wide. The eggs hatchin twelve to fifteen days. The larvae leave the egg-shell through. Fig. 44. — The broadbean weevil ( X 9). PEA AND BEAN INSECTS 61 the side attached to the pod and soon find their way into theyoung beans. The point of entrance is indicated in the driedbeans by a small black dot. The larva very closely resemblesthat of the pea weevil. It eats out a cell in the bean, its posi-tion being indicated by a transparent spot where the larva haseaten out the contents under the outer hull. In California thelarvae begin to pupate about the first of August and transformto adults the same season. Hibernation usually takes place inthe beans but if they are kept in a warm room, many of theweevils will emerge in storage. From one to five larvae may befound in a single bean. There is only one generation annuallyand the weevils do not breed in dried beans. Infested beansare lighter in weight and their value as food for stock is con-siderably lessened. Furthermore, the percentage of germina-tion even of beans containing only one la
Size: 1395px × 1791px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyo, bookyear1918
