340 ixsECTrcinKs, funchcides, and weed killers. 



and the altises return if the treatment be not repeated up to the time 

 the plant need no Ioniser fear their attack. A mixture of naplithalene, 

 sand, or dry earth may be spread on seedHn<;s with the same success. 

 Naphthalenized sawdust is much used to destroy altises of kitchen 

 gardens. It is made by dissolving 10 lb. of naphthalene in -^- gallon of 

 coal tar, then pouring the solution obtained on 20 lb. of quicklime 

 previously slaked with water. After thinning the whole down in 15 

 gallons of water the sawdust is drenched therewith. 



Gri/llotaljJa vulgaris (mole cricket). — To drive it oif it suffices to 

 bury a little naphthalene in the ground as it is being tilled. 



Ants. — Sow a mixture of naphthalene and lime where necessary 

 (Mohr). 



Anthomyia antiqua, Meig. (onion fly). — Sawdust (naphthalenized) 

 or naphthalene buried in the soil when the onions are planted drives 

 off the fly from these plants and prevents them from laying their eggs. 



Tinea yranella, L. (grain mite) ; EpJiestia Kuehniella (flour mite). — 

 The grubs of these tinea cause considerable havoc ; the first in 

 granaries, and the second in flour rriills. They may be removed by 

 spreading naphthalene in the stores. Seed-corn may be mixed with 

 naphthalene without prejudice to its germinative capacity, but its 

 action is less efficient than that of carbon disulphide, and naphthalene 

 cannot be put in contact with flour to be used as food. 



Carpocapsa pomondla (codlin moth).^ — Taschenberg recommends 

 to hook on to the tree rags steeped in naphthalene to prevent the 

 females from laying their eggs on the young apples. 



Conchylis ambignella, Hubu. (cochylis of the vine). — Pradel advises 

 simultaneous treatment of oidium and cochylis by a mixture of sulphur 

 9 lb. and naphthalene 1 lb. Dufour has, however, shown that the 

 vapours and the soapy emulsions of naphthalene did not have much 

 action on the caterpillars of the cochylis. This treatment, which has, 

 however, given satisfactory results on the large scale, would only 

 drive away laying females and cause the grown caterpillars to fall to 

 the ground. Dr. Paul Cazeneuve found that all the methods of treat- 

 ment against this insect, pyrethra, soapy emulsions of turps, and petro- 

 leum, yield inferior results to the sulphur and naphthalene mixture. 

 Spraying on the grapes is done by a mechanical sulphurator as soon 

 as flowering commences. Some caterpillars already on the grapes 

 quit them precipitately after this naphthalenized sulphurating, the 

 odour of which is repugnant to them. The last treatment is given 

 between 1 and 10 August to combat the second generation of the 

 cochylis. The taste of naphthalene in the wine is not to be feared, 

 because there is no adherence ; it is washed ott' by the rain. When 

 oidium is not to be combated sulphur may be replaced by talc or 

 plaster. To make an intimate mixtui^e of talc or plaster it must be 

 passed through a crushing mill (edge runners or flat stones?). 



Aphides. — Taschenberg advises to project a mixture of 1 part of 

 naphthalene with 2 parts of ashes or plaster. The moment is chosen 

 when the leaves are moist with dew, or this treatment is preceded by 

 spraying with water. 



Schizoneura lanigera, Hausm. (woolly aphis). — Solutions of 1 part 



