. The insect and other allied pests of orchard, bush and hothouse fruits and their prevention and treatment . Insect pests; Fruit. Insects, etc., I))jt(rious to tjie. Pear. 341 arc three jjairs of yellow claw-like legs. Thcic arc no ]irolcgs at all, but on the anal scoment are two long liackwardh' iirojccting spines, looking like antenna:'. The antenn;r arc long. A dark green line shows down the middle of the body, caused by tlie alimentary canal containing tlie green leaf substance upon which the larva:- have been feeding, Ha\'ing no prolegs they walk with difficulty when once they have left
. The insect and other allied pests of orchard, bush and hothouse fruits and their prevention and treatment . Insect pests; Fruit. Insects, etc., I))jt(rious to tjie. Pear. 341 arc three jjairs of yellow claw-like legs. Thcic arc no ]irolcgs at all, but on the anal scoment are two long liackwardh' iirojccting spines, looking like antenna:'. The antenn;r arc long. A dark green line shows down the middle of the body, caused by tlie alimentary canal containing tlie green leaf substance upon which the larva:- have been feeding, Ha\'ing no prolegs they walk with difficulty when once they have left their web, wriggling much like a wojan and progressing backwards witli ^â iolence if touched, much after the manner of the caterpillar of the Garden Swift (ILrpinliix Iiijuilihus). They exude a drop of clear deep coffee-coloured fluid from the mouth and from behind the head and other parts when frightened. This fluid is sometimes Cjuite red and clear, looking like blood. They will expel this \\-hen an Ichneumon settles upon them. Its function is evidently to frighten off such enemies. AMien in the webfiing they wander about with much case, usually collecting together in a group w hen not feeding. The larva- never seem to actually leave the nest, l_iut when feedirrg they partly expose their bodies outside the tent and devour the leaves all round. They com- mence by devouring the edges of the leaves and work down to the mid rili, which generally seem to leave intact. AVhen the leaves around the nest are all cleared they form anotlier tent near the last and connnence afresh. As manv as six nests may l:ie found on one }iear tree, evidently all formed liy the same cnlouy. There is considcralde variation in the time of appearance, U>y in the same tree fully matured and half grown larva- may occur. The first date of pupatiim observed was the iVth of July, but l)y August many larva^- were still alive in ISOO. Eoughly speaking, the larva- take five weeks to mature. I'hey then attain
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectinsectpests, bookyear
