Show FALSE CABBAGE APHIS y found in injurious numb numbers rs in fall of the year possibility of its importance as green house pest sooner or later Is evident insect injures by suck ng plant juices by I S 3 DAVIS the false cabbage abbage aphis which ch closely resembled the cabbage aphis is to be found in injurious numbers more often in the fall of the year and in large colonies on the undersides i of the leaves lean es of such el chops aps ops as turnips and radi radishes hes la in addition it occurs in greater or less abundance on cab bage kale mustard and ripe as well as on such wild plants as black mus tai taid d and shepherds I 1 lurae urbe wh ie le it seems to be primarily a pest of gar den and field clope tl e fact that it occurs on oil tenN ten week Neek stock and rad ibi es in greenhouses makes tl e pos s b lity of its importance as a green I 1 ou on e pest kocner or later evident this insect injures by sucking the plant juices usually weakening the plant and causing the leaves to be dwarfed or deformed defoi med it is more pro lifie than any othel species of plant louse that has been sufficiently stud ed for comparison giving rise to an av enge of IT 17 or 18 generations annu ally each matui matuie e apt id giving birth to in an average of 90 3 oung the natural enemies of this aphid include the well know knon n lada bird beetles the larvae of certain flies cies and various internal parasites paia sites climatic conditions have hae little effect upon the aphids the usual in false cabbage aphis applicable to plant lice in kiy ty be used against this species any ap to be efficient however must come in contact with the aphids and since the false cabbage api is orda feeds on the under surface of the leaves it Is necessary to spray from beneath when practicable a rotation of crops Is desirable and care should be taken to keep donia the weeds fall plowing of the old tur nip rill field should be adopted |