274 



The sawfly, Athalia colibri, Christ., appears twice a year, first in. 

 May and secondly in July ; it hibernates in the larval stage and attacks 

 raddish, turnip, etc. Eriosoma lanigerum. Haw. (woolly aphis) may have 

 as many as 10 annual generations. The sawfly, Hylotoma mali, Mots., 

 has three annual generations, hibernating in the larval stage, and is a 

 serious pest of apple foliage. The moth, Phyllorycter {LitJiocoUetis) 

 malivorella, Mots., has six generations and hibernates in the adult 

 or pupal stage under fallen leaves. It chiefly attacks young apple 

 foliage. Another undetermined Microlepidopteron is injurious to 

 apple leaves. The Lamellicorn beetle, Lachnosterna diomphalia, 

 Butl, appears in July and August, and hibernates in the larval stage ; 

 it feeds on roots of both living and decaying plants. Metzencria sp. 

 appears once a year and hibernates in pupal stage. This moth pro- 

 duces galls on pear branches. An undetermined Chrysomelid beetle 

 also infests pear leaves. The Limacodid moth, Parasa sinica, Moore, 

 appears twice a year and hibernates in the larval stage ; it attacks- 

 the foliage of pear, apple, peach, plum, cherry, apricot, etc. An 

 undetermined Aphid infests peach, plum, apricot, etc. The weevil, 

 BycHscus lacunipennis, Jekel, hibernates as an adult which becomes 

 active in May and attacks young vine leaves. The moth, Dendro- 

 limus remota, Wlk., which passes the winter in the larval state, attacks 

 pine. The sawfly, Diprion basalis, Mots., passes the winter in the egg 

 stage, the larva appearing at the end of April and attacking pine. 

 Porthetria {Lymantria) dispar, L. (gipsy moth) winters in the egg 

 stage, the caterpillars appearing at the end of April and attacking 

 black alder, apple, Quercus senata, etc. A species of Nematus winteri 

 in the larval state within the cocoon and attacks black alder. The 

 Chrysomelid beetle, Plagiodera distinda, Baly, which attacks willow, 

 has two annual generations and winters in the adult stage. Drymonia 

 (?) manleyi coreana, Nag., passes the winter as an egg, and the larva 

 attacks Quercus senata. All the above insects are described and 

 figured in detail. 



In the second part of this report the life-history of Chilo simplex, 

 Butl., is described. The moths of the first brood appear in large 

 numbers at the beginning of May, and those of the second brood 

 in August. The first brood adults do not lay eggs on the apex of the 

 rice leaf, as is the case in Japan, and oviposition mostly occurs in 

 the leaf-sheath or on the under-side of the leaf. Unlike the Japanese 

 race, Korean individuals chiefly hibernate in the rice stubble, so that 

 the burning of it is an effective measure. Leaf-hoppers and locusts 

 are also abundant and do some damage to rice. 



Other pests recorded include a Nematode infesting wheat, Phylloxera 

 on vines, and an undetermined Buprestid boring in apple trees. 



Kawamorita (R.). Fusan-Sanga no Yobo ni (suite. [The Prevention 

 of Inferti'ity in Silkworms.] — Sangyo-Shimpo [Journal of the Silk 

 Industry], Tokyo, Year xxvii, no. 313, 1st April 1919, pp. 221-224. 



Infertile individuals among silkworms are usually more common 

 in the introduced European race and its hybrids. This may be 

 prevented by feeding with mature foliage only and ensuring that 

 the mulberry plantations are fully exposed to air and sunshine, and 

 not too heavily manured. 



