92 A?i7ials of Hortic2dtu7'e. 



received from the others. Coquillet has an excellent and inter- 

 esting article * on the use of hydrocyanic acid gas for the de- 

 struction of the red scale in California. He finds this perfectly 

 effective, and describes how, after the necessary apparatus has 

 been obtained, the gas can be produced at a cost of about 26 

 cents per ordinary sized tree, quite a reduction from the older 

 method which costs about 76 cents per tree. 



''Val^ry Mayet has issued a work on ' Les Insects de la 

 Vigne' (Paris 1890, pp. 470, 5 plates, 4 colored, and 470 fig- 

 ures), which is the most complete and important ever issued 

 on the subject, but calculated of course more particularly for 

 the European grower. 



'' Newman f finds bagging grapes an effective protection 

 against insect attack, but recommends it only for choice 

 bunches. 



''Riley has described the early stages of the rose-chafer | 

 (^Macrodaciylus subspinosus), and gives a resume of the history 

 of the species as an injurious insect. No additions to reme- 

 dies against the mature insects are made, but it is suggested 

 that if their breeding places could be found, kerosene appli- 

 cations might destroy the larvae. J. B. Smith has given his 

 experience § with this insect in New Jersey, and finds that 

 none of the recommended applications are of the least avail 

 when the invasion is an extensive or serious one. It costs 

 more to protect the vineyard than the resulting crop is worth, 

 and he recommends bagging as the only practical remedy. 



''On currants. Miss Ormerod || describes an interesting 

 attack by mites {Phytoptus ribis) for which no practical remedy 

 has yet been found; and a white woolly scale (yPulvinaria 

 ribesice) allied to our cottony maple scale, for which she re- 

 commends whitewashing the plants in the winter. Koebele 

 reports \ that in the Santa Cruz mountains, California, it is 

 impossible to raise currants, owing to the attacks of one of the 

 buprestid beetles {Chyrsobothris inali), the larvae of which bores 

 into stems, branches and even roots. Collecting the beetles, 

 burning infested stalks, and whitewashing as a protection, are 

 suggested as possible remedies. Gillette also calls attention to 

 a new currant borer ** {^Hyperplatys aspersus), a beetle, hereto- 



* Insect Lifeii. 202. fBull. 10, Ala. Exp. Sta. 



X Insect Life ii. 295. g Garden and Forest July 16, 1890. 



li p. i,^, report supra cit. \ Bull. 22, Div. Ent. U. S. Dept. Agl. 

 **Bull. II, Iowa Exp. Sta. 



