The beet leaf-beetle /

wees Se ee Se ee 4 Experiments with insecticides______ 19 REPOS Of in URLeS= == eee 5 Recommendations for control_____-21 SOO Grp la mts = es ee ee Ali UTA Tyee eee ee ae 22 Occurrence and extent of injury___ 8 niteratumren Clie ers -=e ee 2 Dat eCRO IS COLY wees fe ee 10 INTRODUCTION.In the Rocky Mountain States sugar beets are subject to attack by the beet leaf-beetle, known in some localities as the "alkali bug," and in others as the " French bug."The principal injury caused is due to the attack of the larve, although the beetles also inflict considerable damage, hundreds frequently.being found on a single plant, which is entirely consumed or so injured that it shrivels and dies.(See Pl.L.)Injurious attack first attracted attention during 1897 and 1898, when injuries were noted both in New Mexico and Colorado.Prior to that time this insect was not known to injure cultivated plants, having confined its attack to such weeds or wild plants as the seablites, Russian thistle, and saltbush.DESCRIPTION. THE ADULT.This insect is related to the imported elm leaf-beetle,?and is of similar appearance to that species in the larval, pupal, and adult stages, but it is considerably larger, and the beetle has a longer thorax, and is differently marked. 1 Monoxia puncticollis Say.; order Coleoptera, family Chrysomelidae, 2 Deceased.3 Galerucella luteola Mill, 186598°-20 1 able in color from entirely black to pale, generally with the outer half dark, the base pale, fifth joint always shorter than the fourth or sixth.Head coarsely and closely punctate.Thorax not quite twice as wide at base as long at middle, broader at base than apex, sides freely arcuate, base broadly emarginate at middle, oblique each side, hind angles distinct; disc usually irregular, with broad, vague depressions each side, so that at times the sides of the thorax appear deplanate, a vague median impressed line, surface very coarsely and irregularly punctate; elytra closely punctate and finely pubescent, the punctures coarser near the base, fine and closer toward the sides and apex.Body beneath finely sparsely punctate and pubescent.Length .27-.34 inches; 7-8.5 mm.Male.Claws [fig. 1, .¢]finely bifid at tip; last ventral segment obtuse, with a short median linear impression near the apex.* Figures (italic) in parenthesis refer to '' Literature cited," p. 23.