. Agricultural zoology. Zoology. 108 ZOOLOGY. the tender plants, and always in such a way as to present a toothed appearance (Fig. 78). It often happens that in a large field one can scarcely find a pea-leaf with uninjured margin. When the plants are somewhat grown the damage done by the weevils is of no further importance; but if the plants, when still very young, are prevented from growing rapidly by reason of rough cold weather or unfavourable con- ditions of soil, whUe at the same time the weevils continue their attacks, the small leaves will be com- pletely destroyed, and the plants wOl p
. Agricultural zoology. Zoology. 108 ZOOLOGY. the tender plants, and always in such a way as to present a toothed appearance (Fig. 78). It often happens that in a large field one can scarcely find a pea-leaf with uninjured margin. When the plants are somewhat grown the damage done by the weevils is of no further importance; but if the plants, when still very young, are prevented from growing rapidly by reason of rough cold weather or unfavourable con- ditions of soil, whUe at the same time the weevils continue their attacks, the small leaves will be com- pletely destroyed, and the plants wOl perish. The larvse gnaw the roots of the plants infested by the weevils. Bemedy: rational rotation. The Mouse-toothWeevils (Baris, or Baridius). Small, tolerably elongated weevils with fairly long neck- shield (Fig. 79). Develop in cruciferous plants. The Rape Mouse-tooth Weevil {B. chloris). Shining green. Leaves in spring its hiding-place in the soil; the female then lays her eggs in the leaf-axils or stem of rape or turnip. The larva eats out passages in the stem and branches; in July it becomes a pupa in the inside of the stem; in late summer the beetle appears, and quickly creeps into the soil. Bemedy: Pulling up and burning the rape and turnip stubble, which harbours the weevil. The Pitchy Mouse- tooth Weevil (B. ficina), one- sixth of an inch long, shining black. Similar habits to the previous species; but lives ex- clusively in headed cabbage and liG. ?9. — Mouse-tooth Weevil ya • j (^Baridius ckUrria). 1, Una; cauliilower, never m rape and ^r™?Jhl'^':b"mTLl^; turnip. The Cress Mouse-tooth 2, pupa, magnified: 3, iieeHe; WeSVll (B. lepidU), black with drawn of the natural size above; n, -iiii i a. eye; ig, antannary groove blue Or greenish-DlUe Dack, OUC- with antenna not drawn back, eighth of an iuch loUg. LivCS in the stems of cauliflower and garden cress. The Gall Weevils {Cewtorhynchus) are very small. Please note that these images are extracted from scanne
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1894
