438 



temperature of 54° F. for 48 hours without food, a treatment that 

 induces them to spin their cocoons. Experiments however show that 

 their condition is not permanently improved by this treatment, and that 

 the disease is only temporarily arrested, to regain its virulence later. 



FujiMA (D.). On the Discovery of a Plant Suitable for Feeding Silk- 

 worms. — Bulletin de V Association Sericicole du Japan, Tokyo _ ii, 

 no. 12, 25th December 1917, pp. 1-16. (Abstract in Mthly. Bull. 

 Agric. Intell. & PI. Dis.,Rome,\x, no. 6, June 1918, pp. 728-729.) 



Since it is not unusual for young mulberry leaves in Japan to suffer 

 from drought and frost, search has been made for frost-resisting 

 plants suitable for feeding silkworms, in addition to Cudrania triloba 

 (silkworm thorn) and Broussonetia kazinold, which are already known 

 to be useful for the purpose. 



It has been found that Lactuca brevirostris is perfectly suitab e, the 

 plant starting to grovf early in spring and reaching a height of 6 or 7 ft. 

 by the autumn. If cut in summer, it rapidly produces shoots, so that 

 the leaves can be used continuously from spring to autumn. Silkworms 

 fed on these until the second moult gave better results than those 

 on mulberry, the results being only slightly inferior with those fed 

 in this way up to the third moult. 



Zanon (V.). Dictyothrips aegyptiacus, a Thysanopteron injurious to 

 the "Black Morocco" Variety of Vine, in Cyrenaica. — UAgri- 

 cidhira Coloniale, Florence, xi, 2ud half-year, no. 6, 1917, 

 pp. 394-397, 2 plates. (Abstract in Mthly. Bull. Agric. Intell. & 

 PL Dis., Rome, ix, no. 6, June 1918, p. 773.) 



During 191G and 1917 Dictyothrips aegyptiacus,Msirch.Si\,\va,siound 

 to be present in Cyrenaica almost exclusively on the " black Morocco " 

 variety of vine, which was grown on a trellis and was suffering somewhat 

 from drought. 



This thrips not only soils the foliage with its excreta, but causes the 

 formation of discoloured areas on the leaves, with subsequent withering. 

 Notes on the morphology and life-history are given. 



Melander (A. L.). Spraying Formulas for Garden and Orchard Insects. 



— Washington State Coll., Pullman, Extension Service, Series 1, 

 no. 35, January 1918, 16 pp., 9 figs. ; and no. 39, March 1918, 

 16 pp., 10 figs. [Received 8th August 1918.] 



These pamphlets deal with the biting and sucking insects commonly 

 attacking garden crops and orchards, and give formulae for the usual 

 poison solutions, together with practical instructions for spraying 

 and fumigation. 



Saunders (J. G.). Prevent Grain Losses by Early Threshing. — WJcly. 

 Press Bull. Pennsylvania Dept. Agric. Harrisburg, iii, no. 30, 25th 

 July 1918. 



Attention is drawn to the fact that the heavy loss, amounting to 

 £200,000 in eastern Pennsylvania, due to damage in stored grain by 

 the Angoumois grain moth [Sitotroga cerealella] may be prevented 



