273 



Harukawa (T.)- Momo-Habachi ni tsuite. [Oa the Peach Sawfly.] 

 — Byochugai-Zasahi [Journal of Plant Protection], Tokyo, vi, no. 1, 

 5th January 1919, pp. 51-59, 1 plate. 



A new sawfly, Eriocampoides matsumotonis, is described. It is 

 closely allied to E. limacina, Retz., of Europe and America, from which 

 it may be distinguished by the sooty tint of the wings. Its broods 

 appear to be very irregular, but from breeding experiments three 

 generations per annum appear to be the usual number. Winter is 

 passed in the larval state within cells in the ground, and it is note- 

 worthy that, as in E. limacina, some mature larvae of the second brood 

 hibernate in that stage. The egg is laid singly beneath the epidermis 

 of the upper surface of the leaf, oviposition being effected by the 

 female insect from the under-side. The blisters thus caused are 

 transparent in the case of the peach and of a brownish colour in the 

 cherry. Thfe number of eggs laid by a single female is 22 or 23 on 

 an average, and parthenogenesis may occur. The peach, pear, 

 cherry (both the flowering and fruiting varieties) and plum are attacked, 

 especially the first two. An Ichneumonid parasite of the larva was 

 discovered in 1918. As preventive measures emulsions of soap or 

 kerosene are efficacious, as well as collection of the pupae in winter. 

 Lead arsenate is also recommended. 



Sangyo Torishimari Seiseki. [Results of Silk Industry Control in 1917.] 

 — Agricriltnral Bureau. Bepariment of Agriculture and Commerce, 

 Tokyo, 25th March 1919, 226 pp., 2 maps, 1 table. 

 This is a statistical summary of results from reports from the 

 prefectural Governments during 1917, relating to the application of 

 regulations respecting the silk industry. It describes the results of 

 measures for the prevention of disease in silkworms and for the cold- 

 storage of broods. 



Gaichu ni kwansuru Chosa. [Researches on Injurious Insects.]^ 

 Kwangyo Mohanjo Kenkyu Hokoku [Btdletin of Industry Model 

 Statiori], Suwon, Korea, March 31st 1919, 82 pp., 13 plates. 



In this report, the life-histories of, and preventive measures for 

 dealing with the following insects are described. The ChrysomeHd 

 beetle, Donacia aeraria, Baly, has one annual generation and hiber- 

 nates in the larval stage in the earth, where it attacks the roots of 

 rice. The eggs require to be in water and die if exposed to the air. 

 They are usually laid on the under-side of the floating leaf of Potamo- 

 geton polygonifolius at the end of July, so that removal of this plant 

 proves to be an effective preventive measure. A weevil, Echinocnemus 

 bipunctatus, Roel., also has one annual generation ; it hibernates in the 

 larval stage under ground the adults appearing in July. It attacks 

 the roots of rice in considerable numbers. The Noctuid, Cirphis 

 unipuncta. Haw., passes the winter in the pupal stage, the adults of 

 the first generation appearing in June and those of the second in 

 July. It attacks rice, Bengal grass, oats, wheat, Panicum friimen- 

 taceum and sorghum. Serica sp. occurs once a year, the adult beetles 

 occurring from April to June. It hibernates in the larval stage or 

 occasionally as an imago. It attacks barley, tobacco, cotton, hemp, 

 SO] a bean, cabbage, peach and mulberry. 



