32 The Bulletin. 



Diamond-back Moth. The "worm" is a small, slender, green caterpillar, 

 which lives chiefly on under sides of the leaves, and eats small round 

 holes. 



Injury, etc. — Injury by this insect is not known to be serious in 

 North Carolina, but its work has been noticed and it is an insect which 

 might under circumstances favorable to it, be a serious pest. 



When grown the caterpillar spins a small cocoon which is attached 

 to the leaves, and from this the tiny moth emerges. When the wings 

 of the adult moth are spread it is not over one-half inch from tip to 

 tip of the wings ; the insect is slenderly built and with narrow wings, so 

 it is a small, frail, inconspicuous insect. 



REMEDIES. 



There is nothing to be said on the subject of remedies further than 

 to refer to what is said regarding remedies for imported cabbage worm. 

 (Page 27.) 



THE CABBAGE WEB-WORM. 



(Hellula undalis.) 

 Order Lepidoptera, Family Pyralidw. 



Description. — Yellowish-gray worms or caterpillars, with brownish 

 stripes on the back, measuring little over one-half inch when grown, 

 feeding in the bud or crown of plants, or on the underside of the leaves, 

 and covering themselves with a web. 



History. — The credit for first detecting this insect in this state belongs 

 to Prof. R. I. Smith, Entomologist to the Experiment Station and 

 Agricultural College, who found it quite abundant on turnips at West 

 Ealeigh in October, 1907. It had not been recorded at all by the writer 

 in the seven years preceding. It is likely that it is not destructive every 

 year. Prof. Smith discusses this insect in Bulletin 197 of the X. C. 

 Experiment Station, and from that publication the following account 

 is largely taken. 



The cabbage web-worm has only been known in North America in 

 comparatively recent years. The first record which we find was at 

 Charleston, S. C, in 1895, and considerable damage was done by it in 

 1896. It was destructive in Richmond County, Ga., in 1898, and was 

 destructive near Augusta the same year. In 1899 it was destructive 

 at Athens, Ga., and at Auburn, Ala. ISTow that it is known to occur at 

 Raleigh there is reason to believe that it is present at many places in 

 the State, and it is therefore well that growers should know something 

 of it. 



Injury. — The worms seem to prefer feeding in the bud of young 

 plants or on the undersides of the leaves or in the crown of plants like 

 turnips and beets. On turnips they may burrow into the crown, making 

 shallow clumnols, and also eat off the leaves at their bases. The worms 

 cover themselves with a web, probably remaining under it most of the 

 time, though they may leave it at night to feed. Young plants are 



