Half hours with insects . zefrom the fully grown worm (Fig. 129; &, pupa; c, beetle,after Ililey). Says Dr. Fitch, If the outer dark coloredsurface of the bark be scraped off with a knife the last ofAugust or forepart of September, so as to expose tlie clean 3 164 HALF HOURS WITH INSECTS. [Packard. white bark beneath, as can easily be done without any injuryto the tree, wherever there is a j^oung worm it can easily bedetected. A little blackish spot, rather larger than a kernelof wheat, will be discovered wherever an egg has been de-posited, and by cutting slightly into the bark the worm willb
Half hours with insects . zefrom the fully grown worm (Fig. 129; &, pupa; c, beetle,after Ililey). Says Dr. Fitch, If the outer dark coloredsurface of the bark be scraped off with a knife the last ofAugust or forepart of September, so as to expose tlie clean 3 164 HALF HOURS WITH INSECTS. [Packard. white bark beneath, as can easily be done without any injuryto the tree, wherever there is a j^oung worm it can easily bedetected. A little blackish spot, rather larger than a kernelof wheat, will be discovered wherever an egg has been de-posited, and by cutting slightly into the bark the worm willbe found. It gradually works its way onwards through thebark, increasing in size as it advances, until it reaches thesap-wood ; here it takes up its abode, feeding upon and con-suming the soft wood, hereby forming a smooth, round, flatcavity, the size of a dollar or larger, immediately under thebark. It keeps its burrow clean by pushing its excrementout of a small crevice or opening through the bark, which it Fig.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectinsects, bookyear1881
