58 EXPERIMENT STATION EECORD. 



Carolina poplars were attacked by the cotton leaf beetle (Lina scripta). An 

 entirely new wheat insect, probably an Eleotles, appoaretl among the wheat 

 fields, the larvjc attacking the seed in the gronnd before it germinated. 



Other insects mentioned are a sawfly {Monostege rosce) which injured culti- 

 vated roses, the Colorado potato beetle, potato stalk borer, and cabbage but- 

 terfly, and a new grass-infesting scale {EiiopcJtis coloradensis). A detailed 

 study of the life history of this scale showed it to be at least 2-brooded and 

 capable of becoming a very important pest of the wild-hay crop in the western 

 counties of the State. 



Report of the entomologist, D. L. Van Dine { Hawaii Sta. Rpt. 190S, pp. 11- 

 jfl). — Investigations were made of the insects affecting live stock and bee keep- 

 ing, and in Oahu further work was undertaken on the insects affecting pine- 

 apple, cotton, and mangels. The horn fly and sheep-maggot fly iCaUiphora 

 dux) are discussed and brief mention is made of several important cotton in- 

 sects, of which a more detailed account is noted below. 



The year is reported to have been marked by a decided impetus to the bee 

 keeping industry, the season's crop showing an increase from 600 tons to nearly 

 1,000 tons, and the honey and wax crop being estimated as worth $100,000. 

 The number of colonies at present in the Territory is not far below 20,000. A 

 list is given of the honey trees and plants found in the Islands. 



The mealy bug {Pseudoooccus citri) has become as serious a pest of the pine- 

 apple as is the pineapple scale {Diaspis hromelice), previously noted (E. S. K., 

 16, p. 683). Aside from the injury to the plant, the mealy bug injures the fruit 

 directly by its feeding and indirectly by acting as an agent in the spread of the 

 pineapple rot. During the season it was demonstrated that the scale and 

 mealy bug can be controlled in the field and that clean shipments of fruit are 

 possible by proper methods of fumigation. 



Trial fumigation of plants before setting them in the field indicates that 

 plants will not stand as large a dosage of hydrocyanic gas as will fruit for ship- 

 ment. For plants to be set in the field it is recommended that for every 100 

 cu. ft. of space, 1 oz. potassium cyanid, 2 fluid oz. sulphuric acid, and 4 fluid oz, 

 of water be used, with an exposure of li hours. For fruit for shipment lA oz. 

 of potassium cyanid for every 100 cu. ft. of air space is recommended. For 

 field treatment an emulsion of kerosene is recommended for the scale and 

 tobacco dust for the mealy bug. 



A revised list is given of the injurious insects of Hawaii, 



Keport on the insects which affect the cotton plant in the Hawaiian 

 Islands, D. T. Fullaway {Hawaii Sta. Bui. 18, pp. 5-21, figs. 78 ).— Although 

 cotton has not up to the present time been one of the agricultural industries in 

 the Hawaiian Islands, experiments conducted by the station haA-e given re- 

 markably promising results. This investigation of the insects affecting the cot- 

 ton plant has been conducted in view of the fact that the profit to be obtained 

 from its growth will largely depend upon the extent of the insect injury. 



In Honolulu, a stem maggot has been found which attacks the plant soon 

 after germination. Although adults have not been bred it is thought to be a 

 common species, as carnations and pigeon peas have been noticed to suffer from 

 similar attacks. A wireworm which attacks germinating cotton is thought to 

 be Simodactijlus cinnamomcus. Agrotis ypsilon is the cutworm which has been 

 observed to attack cotton most frequently. Cotton suffers more or less from 

 Aphis gossypii, and at certain seasons the damage becomes a great handicap to 

 the plant. Adoretus tcmtimaculatus has injured cotton to some extent through 

 attacking the foliage. The mealy bugs Pseudococcus virgatus and P. fllainenfo- 

 sus are serious pests, the former occurring in the Islands on Dolichos lablab, 



