| Show cankerworms CANKER WORMS ARE INJURIOUS TO FRUIT AND OTHER TREES during abundance periods they do much damage prepared by the united state Depart departie me nt or of ASri agriculture culture Canker have been known in this country since colonial days but not until about fifty years ago was it realized that two species were present they have since been known as the fall cankerworm pome tarla harris and the spring cankerworm canker Pale bernata peck the economic and scientific history of these two species and the differences between them together with a discussion of their feeding habits distribution means meana ot of dissemination and measures necessary to control each species are included in a new united states department ent of agriculture bulletin 1238 1 tho by P A potter porter and 0 EL alden the bUll bulletin bulletti etli ita in available whis while the supply lasts upon application to the he un united cited states department of agriculture washington D 0 Canker cankerworms worms attack elms and apple trees by preference but are often found on many of the common deciduous fruit forest and ornamental trees during periods of abundance canker worms do great damage practically de foliating the trees they attack un less lees controlled they are most likely to become abundant in neglected orchards or in shade and forest trees canker worms are held in fluctuating degrees of control by many factors among which are unfavorable weather birds and parasitic and predacious insects plowing during the summer and fall will aid in co control of the spring species amae S both species siedea are readily controlled by prow proper spraying and often by the use of mechanical I 1 bar alera to prevent the ascent of the tb moths ind and newly batched la amo |
