Report on the Rocky Mountain locust and other insects now injuring or likely to injure field and garden crops in the western states and territories . nd only eggs, newly-batched larvae,and a few wingless, egg-bear-ing mothers are seen. Tbelatter are said to die duringtbe winter, and consequentlythe species in winter is repre-sented by the larvae and a feweggs. In spring the larvae molttheir winter coat, and, afterattaining maturity, lay eggs laid by tbe wingedfemales are placed in thedownof the leaf of the vine, butmore commonly in tbe eartharound the roots. As to remedies, one hun-dr
Report on the Rocky Mountain locust and other insects now injuring or likely to injure field and garden crops in the western states and territories . nd only eggs, newly-batched larvae,and a few wingless, egg-bear-ing mothers are seen. Tbelatter are said to die duringtbe winter, and consequentlythe species in winter is repre-sented by the larvae and a feweggs. In spring the larvae molttheir winter coat, and, afterattaining maturity, lay eggs laid by tbe wingedfemales are placed in thedownof the leaf of the vine, butmore commonly in tbe eartharound the roots. As to remedies, one hun-dred and forty have alreadybeen proposed in France, butnone are infallible. The best r,^ ro rr 7. , , 1. general remedyisflooding tbe Fig. 52.—T^v^ radicicola. «, 0, pupa andimago of a *• if • problematic individual,orsupposed male ; c,rf, its^^^^^[^ ^ autumu or WIU-anteuna and leg ;e, vesicles found in the abdomen, ter. The best specific appli- (After Riley.) catiou has been found to be the bisulphide of carbon, two ounces to be placed in a bole near the root, theearth becoming impregnated, the insects are killed. Mr. Hiley has urged. j-ACKAED.] THE GRAPE FORESTER. 785 the use of resisting Auiericau viues as stocks, and this is undoubtedlyone of the best preventive measures which can be adopted. The writerwould like to know how extensive in the Eastern States is the distribu-tion of the phylloxera. The galls are at once recognizable, and appearin midsummer, while the root-form may be detected by little swellings onthe rootlets, in which the small greenish-yellow lice may be detectedafter close examination. The following recapitulation of the different forms in the insect istaken from Professor Rileys article on the Fhyollexera in JohnsonsCyclopedia: 1. The gall-inhabiting type (gaUwcola), forming galls on the leaves, and presenting—a, The ordinary egg (Fig. 50, c), with which the gall is crowded; b, The ordinary larva, (Fig. 50, a, h);c, The swollen xjarthenogeuetic mot
Size: 1601px × 1560px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1870, booksubjectb, booksubjectinsects
