32 PAPERS ON INSECTS AFFECTING VEGETABLES. 



former, an ichnenmonid, was reared in September from material 

 received from Auburn. Ala.; the latter, a braconid, issued during the 

 latter days of July from larvae received from Charleston, S. C. 



Xovember 12, 1908, Prof. E. I. Smith, West Raleigh, N. C, stated 

 that in attempting to rear larva? of this species several were killed by 

 mites, which bred in great numbers in a single night. Samples of 

 the mites were forwarded to this office, for identification by Mr. 

 Nathan Banks, who reported as follows: 



Tbe mite is Tyroglyphux amcricanus Bks., a species common in the Eastern 

 States and feeding on a great variety of substances. These mites have a mi- 

 gratory stage which is attached to many insects, and so they gain access to 

 places where one would not suspect them. 



THE IMPORTED CABBAGE WEBWOEM IN HAWAII. 



In Hawaii the larva 1 of the imported cabbage webworm (Hellula 

 undalis Fab.) were observed by the junior author 1 attacking cab- 

 bage, radish, kohl-rabi, and " Japanese turnips," at Honolulu and 

 Wahiawa, on the island of Oahu. The investigation was confined to 

 this island, and it was not determined if the species occurs as a pest 

 on the other islands of the Hawaiian group. 



On Oahu cabbage and a few other cruciferous crops are produced 

 to a limited extent throughout the year, for consumption in the local 

 market. Of these crops cabbage is probably the most valuable, 

 although "Japanese turnips" are grown and used quite extensively 

 by the Orientals. These turnips resemble what we in the States call 

 " winter radish," but, unlike radishes, they are cooked before being 

 eaten. 



Most of the cabbage is grown during the cooler months, from 

 November until April. According to the oriental gardeners, the 

 other months of the year are " too hot ? " and the plants seemingly do 

 not thrive. Ordinarily only a few acres are grown annually, and 

 the production is so limited that it becomes necessary to import con- 

 siderable quantities of this vegetable from the mainland to supply 

 the demand at Honolulu and other towns. Cabbage grown during 

 the cooler months is usually of good quality and is said to be a profit- 

 able crop. Under the circumstances it doubtless seems odd to one 

 unacquainted with the conditions that this crop is not produced in 

 sufficient quantities to supply the local demand. The failure to grow 

 cabbage more extensively is due in part to the fact that this crop is 

 preyed upon by a horde of insects. Although most of these pests 

 can be easily controlled, the Chinese and Japanese gardeners are, 



1 The iii)(<>s on the oecurronco of the imported cabbage webworm in Hawaii were made 

 by the junior author while engaged as assistanl Territorial entomologisi and as a collabo- 

 rator of the Bureau of Entomology. Thanks are due Mr. B. M. Ehrhorn for the courtesy 

 of allowing Mr. Marsh to retain these notes. The junior author is not responsible for 

 anj statements made in other portions of this paper. — v. ir. c. 



