| Show ENEMY OF APPLE TREE THEE woolly aphid one of M most ost serious of insect pests new significance cc put upon economic statue status of elm E im curl by olt of maine agriculture agricultural ex berment perl ment station the discovery that the scolly aphid migrates from elm leaf to apple to I 1 a most important one for more than years the woolly aphid has had bad worldwide world wide recognition ae one OUO of 0 the moat most serious insect enemies ot of young apple trees statistics based on observations made at three nurseries containing respectively about and trees showed that from 20 per cent to 25 per dior cent ot of the trees were infested by the wholly aphid As from to forty million of american grown apple seedlings are used in this country ev ery year the significance of so high a percentage of infestation is 15 at once apparent parent ftp it Is therefore there fere with no slight interest that the entomologists of the fainn agricultural experiment station hara been seeking to ascertain certain qs a previously unknown point ID iv the e life cycle of thia this pest and have made the discovery that this cycle includes three generations aich are passed in what ir r i known as the elmleaf elm leaf leat curl 11 toe he disfigured and curled leaves of the elm 14 a the oaring are everywhere as familiar as the woolly masses manses on the apple elm leaf leat curl bark but the elm zene generations rations bavo have not previously been known to have any connection with the apple peat pest and it has all along borne a distinct name but the discovery of the annual ml mi gration of a fresh infestation from the elm to the apple and th knowledge the elm generations are an essen till portion of the life cycle of the wa woolly ily aphid of the apple and that this cannot content i without access to the elm put a bew cance upon the economic status of the elir el ic curl |
