574 EXPERIMENT STATION RECORD. 



The gypsy moth, A. E. Stenb {Nature Guard, 1905, Lesson 42, pp. 173-176, pi. 

 1). — Attention is called to the great damage done to forest and other trees by the 

 gypsy moth. The life history of this insect is briefly discussed and recommendations 

 are made regarding means for controlling it. 



Mites in rubber nurseries, S. Akdex (Agr. Bui. straits and Fed. Malay States, 

 4 (1905), No. 6, pp. 229, 230). — In a case of infested rubber trees the young leaves 

 fall before they are rally developed, as when attacked by red spider. 



The mite causing this trouble appears to be a species of Tarsonymus. The disease 

 is chiefly confined to plants under unfavorable conditions and does not commonly 

 affect trees after they are thoroughly established. In one instance rubber trees were 

 badly affected while suffering as a result of an insufficient supply of water. 



The red disease of the grapevine and its treatment, E. Zacharewicz (Rev. 

 Yd., 24 (1905), No. 618, pp. 447, 44$) ■ — The disease discussed by the author is due to 

 the attack of Tetranychus telarius. The appearance of this mite is discussed and notes 

 are given on its habits. In controlling the pest, good results have been obtained by 

 the use of a mixture containing 95 parts powdered live lime and 3 parts pyrethrum 

 powder. 



Report of the secretary of the American Mosquito Extermination Society, 

 H. C. Weeks (Bayside, L. I.: Author, 1905, pp. 5, pi. 1). — A study was made of the 

 mosquito problem at Wellfleet, Mass. It was found that a swampy worthless area 

 of about 2,500 acres in the vicinity of the town was badly infested with mosquitoes. 



In the treatment of this marsh it is recommended that a dike be constructed tor 

 the purpose of- preventing the entrance of tide water. It is believed that this will 

 enable a better quality of grass to grow on the salt marsh so that the area may be 

 profitable for farming. This will lead to the introduction of proper drainage sys- 

 tems which in turn will prevent the development of mosquito larva?. 



Lantern traps for noxious micro-lepidoptera, A. L. Herrera (Com. Par. Agr. 

 [Mexico], Circ. 25, pp. 3, fig. 1). — A brief description is given of a lantern trap which 

 captured 24,492 insects in a single night when exposed in a cotton plantation in 

 Texas. Among this collection of insects 13,113 belonged to injurious species. In 

 the lantern a mixture was burned containing white pitch, turpentine, linseed oil, 

 and olive oil. 



Nursery fumigation, C. Fuller | Natal Agr. Jour, and Mm. JRec, 8 (1905), 

 Xo. 6, pp. 533-540, figs. 10). — The fumigation of nursery stock before delivery by the 

 nurserymen is recommended as a good practice. For the nurserymen's use it is 

 recommended that the fumigation house should be a permanent structure of wood, 

 iron, or brick lined with gas-tight material located some distance from dwelling 

 houses and subjected, at least once every six months, to a test of its gas-retaining 

 power. Directions were given for the preparation and application of hydrocyanic- 

 acid gas. 



Experiments with fumigating nursery stock, T. B. Symoxs and A. B. Gahan 

 I Maryland Sta. Bui 105, pp. 11-34, figs. 5). — The experiments reported in this bulle- 

 tin were undertaken for the purpose of determining the effect of hydrocyanic-acid 

 gas upon nursery stock. This remedy is believed to be the most reliable one for 

 destroying San Jose scale on nursery stock and it, therefore, becomes important to 

 determine whether or not the treatment is injurious to trees. 



During the experiments 3,000 trees were treated, one-half in the fall and the other 

 half in the spring. The fall treatment was given on October 15 and the spring treat- 

 ment on April 7. Both peach and apple trees were used in these experiments and a 

 detailed record of these experiments is presented in a tabular form. In some cases 

 apparent injuries by the gas would perhaps be attributed to other agencies, such as 

 unfavorable soil conditions after the trees were set out. 



The amount of cyanid per cubic foot varied from below the usual quantity to 6 times 

 the amount ordinarily recommended for fumigating nursery stock. One-half the 



