PBOGEESS REPORT ON THE EUROPEAN CORN BORER 
59 
Celery 
The infestation in celery has been general for the last two years, 
and, although the injured portion of the plants could usually be 
removed with very little commercial injury to the remainder of the 
plant (fig. 27), there was an appreciable loss ranging from 5 to 10 
Fig. 27. — Stalks of celery sectioned to show injury by 
European corn borer 
per cent of the total value of the crop in the worst infested fields, 
owing to the necessity of discarding severely injured plants. During 
1922 the infestation in celery fields showed a considerable increase 
as compared with the previous year. Certain fields of celery, which 
were kept cleanly cultivated and isolated from corn or other sus- 
ceptible plants, showed a severe and uniform infestation. In Table 17 
are given figures relating to field examinations made in celery fields 
of the Boston area showing average infestation. 
