CHAPTER XI 



INSECTS INJURIOUS TO CELERY, PARSNIPS 

 AND RELATED PLANTS 



A CONSIDERABLE number of insects attack celery, but few 

 are restricted to it as a food, and fewer yet do noticeable 

 damage. A large proportion of the insects which live on it also 

 attack carrot, parsnip, and parsley, preferring one or the other 

 of these three plants. For convenience, however, we may con- 

 sider the insect enemies of celery separately. 



INSECTS INJURIOUS TO CELERY 



What is true in this country is equally true in Europe, and 

 there is little danger of the introduction of important pests from 

 abroad. With the increased cultivation of this crop insects which 

 now attack it may increase in injuriousness. but there is no 

 immediate prospect of serious losses accruing from insect at- 

 tack. It is seldom that beds of celery are entirely free from 

 the celery caterpillar; the same may be said of the zebra cater- 

 pillar. The tarnished plant-bug is one of the worst enemies 

 with which the celery grower has to contend, but its having 

 many host plants usually distributes attack except in unusual 

 seasons. Celery generally escapes the ravages of cutworms 

 owing to its late planting and still later replanting, and neither 

 white grubs nor wireworms deter its growth as far as observa- 

 tions go, presumably because of its powerful root and root 

 stalk. The leaves are attacked by leaf-rollers and leaf-tyers 

 and one of these, the celery leaf-tyer, is of considerable im- 

 portance. 



The Carrot Rust Fly {Psila roscc Fab.). — This pest has been 

 injurious to carrots in Canada since 1885 and made its ap- 



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