292 



been used in the preparation of commercial sulphur pastes. It is 

 found that a wettable sulphur can easily be made at home with a 

 weak solution of glue. The formula recommended consists of 1| oz. 

 powdered glue dissolved in 3 U.S. gals, of hot water ; to this is added 

 gradually 10 lb. sublimed or powdered sulphur, the whole being 

 rubbed into a smooth paste free from lumps. The paste should be 

 strained into the spray tank through a fine sieve, a stiff brush being 

 found useful for this purpose. Water is then added to make 200 

 U.S. gals, in all. The most finely divided sulphur obtainable should 

 be used for this work. Tests of this material under field conditions 

 have given very satisfactory results in the control of Tetmnychus 

 telarius (red spider) on prunes and beans. To avoid injury to foliage, 

 it is ad\asable not to apply sulphur or sulphur pastes when the tem- 

 perature exceeds 100° F. So far as is kno-wn, the home-made wettable 

 sulphur described and the commercial sulphur pastes may be mixed 

 with any of the usual sprays without 'alteration of the properties of 

 either. 



.Smith (H. S.). The Pink Bollworm of Cotton.— Mf/i??/. Bull. Cal. Slate 

 Commiss. Hortic, Sacramento, vii, no. 4, April 1918, pp. 196-198, 

 4 figs. 



This article has been compiled for the benefit of those interested 

 in cotton culture, and gives an account of Pectinophora gossypiella, 

 Saund. (pink bollworm of cotton), which, on account of its recent 

 appearance in Mexico, constitutes a menace to Californian cotton- 

 growers, who are warned against the possibility of its introduction 

 in spite of the strict quarantine regulations that are enforced. 



DE Ong (E. R.). The Potato Tuber Moth.— Mthly. Bull. Cal State 

 Commiss. Hortic, Sacramento, vii, no. 4, April 1918, pp. 198-201, 

 3 figs. 



Phthorimaea operculella (potato tuber moth) is the cause of serious 

 damage in California to potatoes both in the field and, more frequently, 

 in storage. It feeds also on wild species of Solanum (nightshade), 

 and occasionally on tomatoes and egg-plants. The hfe-history of the 

 insect is given. Preventive measures are recommended and include 

 the selection of uninfested seed potatoes, and the fumigation of any 

 doubtful ones with carbon bisulphide at the rate of 10 lb. per 1,000 

 cub. ft; for 48 hours, this treatment being given a second time after 

 an interval of about three weeks. Planting should be at least 5 or 

 6 inches deep, so that the tubers may develop far enough in the soil 

 to be free from attack. Careful hilling m\\ also protect the tubers. 

 The crop should be dug as soon as mature and should be promptly 

 enclosed in sacks, as potatoes exposed for some six hours in the day- 

 time are almost certain to have some eggs laid on them. If the pota- 

 toes are "infested when gathered, they should be fumigated in an 

 air-tight bin as described above, and this process should be repeated 

 one or more times at intervals of two weeks, so that larvae that have 

 escaped the first treatment may be destroyed when they come to 

 the surface of the tubers to pupate. Potatoes should be stored in 

 as cool a place as possible. Soaking the sacked potatoes in water 



