Forest entomology . is method coincides with good local husbandry. If young thorns in nursery-lines are very badly attacked with thisspecies, and if such attacked quicks are not strong enough to go out,or otherwise not convenient to put out,it would also be well to cut them downin the nursery-lines, burn the tops, anddig in manure between the rows, so thata strong bushy thorn may be producedby another year. Aphis padi (Eeaum.) This insect is very common on theyoung shoots of Primus padus (bird-cherry). Fig. 283 shows the injuries,or rather the gregarious habits, of thisspecies ; but later on i
Forest entomology . is method coincides with good local husbandry. If young thorns in nursery-lines are very badly attacked with thisspecies, and if such attacked quicks are not strong enough to go out,or otherwise not convenient to put out,it would also be well to cut them downin the nursery-lines, burn the tops, anddig in manure between the rows, so thata strong bushy thorn may be producedby another year. Aphis padi (Eeaum.) This insect is very common on theyoung shoots of Primus padus (bird-cherry). Fig. 283 shows the injuries,or rather the gregarious habits, of thisspecies ; but later on in the year, sayabout the middle of July, nearly every terminal twig of the bird-cherry bush has been killed. It is therefore evident that severe in-juries accrue from this species, as the development of the bush has todepend upon growth being produced in the latter end of the season. The apterous viviparous female is of a yellowish-green colour, some-what variegated with oval stripes, and more or less stained with a. Fig. 2S3.—Aphis padi 071 birddhi i ry. 304 FOREST ENTOMOLOGY. coloured mealy powder. Eyes black; antennae, legs, and corniclesyellow, the last being rather dilated at the base. The pupa is of a greenish or black colour. The prothorax ispartially green, varying to light olive, and the abdominal portion is ofa shining black colour. Eyes and cornicles black ; antennae, and legsolive-green. In the winged viviparous female the whole body is of a shiningblack colour, and brightened here and there with lightish , eyes, and legs lightish-brown. Wings rather large, withsomewhat conspicuous dark stigma. Aphis euonymus (Fabr.) This insect causes the shoots of Euonymus europceus to form a sortof rosette, very much after the manner of the shoots on wild insects cluster under the rolled leaves, and both apterous andwinged forms are either a very dark-brown colour or otherwise whollyblack. Aphis hedeile (Kalt.) This insect is often found very plentifull
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