. A manual of injurious insects with methods of prevention and remedy for their attacks to food crops, forest trees, and fruit. To which is appended a short introduction to entomology . cker, rounder, more heart-shaped, and of adeeper brown; ribesiw is distinguislied from it, especially in the embryo state,which is longer, with the members thicker, the tarsi and tibiie much shorter,and half less in size in P. ribcaim than in P. vilis, and the large hair which isobserved on the tibia in almost all the species is very much longer in tliis one;the antenna;, almost of similar form, have fewer long
. A manual of injurious insects with methods of prevention and remedy for their attacks to food crops, forest trees, and fruit. To which is appended a short introduction to entomology . cker, rounder, more heart-shaped, and of adeeper brown; ribesiw is distinguislied from it, especially in the embryo state,which is longer, with the members thicker, the tarsi and tibiie much shorter,and half less in size in P. ribcaim than in P. vilis, and the large hair which isobserved on the tibia in almost all the species is very much longer in tliis one;the antenna;, almost of similar form, have fewer long hairs; thus in theembryo of Pulviiuirin. r/7/.s- six arc observable, wliilst in rilicxitc there are onlyfive, of wliich that of tlie tliird article and that ol tlic disc of tlie last iuticleare much the longest, the great hair at the cxtniiiity of this article being agood third shorter than these. With regard to tlie cottony matt(;r which isobservable, it is very abundant in this species, and entirely of the same natureas that of P. viti*y—I^ssai sur les Cocliinelles, 15, PiiUiiimin ribcsiic iwhh,par M. Ic Docteur Signorct, p. 219 (vol i. of Collected Essays). x2 308 CiiiTant brancli infested by WhiteWoolly Scale. These very active youngScale insects (fig. 2, p. 306)were whitish or orange incolour, of a flattened ovalshape, broadest near thehead, deeply cleft at thecaudal extremity, with a longhair or filament on each sideof the cleft, that is, one longfilament placed on eachlobe caused by the cleft,and in the centre of thecleft a long cjdindrical pro-cess. The body somewhatraised along the centre,with slightly indicated cor-rugations along it, and sideridges from it, and the sur-face slightly sprinkled withwhite or woolly dark or black. Oneof the special characteris-tics by which this speciesis known is the number andlength of the hairs on theantennae, but in the sizefigured I have only beenable to indicate that hairsare present. The attack occurred o
Size: 886px × 2819px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, bookidmanualofinju, bookyear1890
