316 



hoped to hold a scientific investigation to determine the susceptibility 

 of different varieties of grapes to Nematode infestation. 



The latest legislation and quarantine measures passed in the interest 

 of the California grape industry are quoted. 



Swingle (D. B.). Pear and Apple Blight in Montana. — Montana 

 Agric. Expt. Sta., Bozeman, Circ. 98, August 1921, 10 pp., 3 figs. 

 [Received 12th April 1922.] 



As the punctures of insects, and particularly of Aphids, are one 

 of the chief agencies by which pear and apple blight are introduced 

 into trees, it is suggested that thorough spraying with tobacco extract 

 would greatly reduce the spread of the disease during the summer. 

 The winged adults are considered to be the most important carriers 

 after the bees stop working in the flowers. 



Spraying Programs for the Orchard and Fruit Garden, with Directions 

 as to Sprays to be used. — Mthly. Bull. Ohio Agric. Expt. Sta.. 

 Wooster, vii, no. 1-2, January-February 1922, pp. 19-38. 



This spraying programme gives directions for the preparation of 

 the commonly used insecticides, with calendars for the treatment ol 

 all the principal fruits. 



GossARD (H. A.). Gas Treatment for Peach Borer. — Mthly. Bull. 

 Ohio Agric. Expt. Sta., Wooster, vii, no. 1-2, January-February 

 1922, pp. 39-40. 



The value of paradichlorobenzene against the peach tree borer 

 {Aegeria exitiosa. Say] [R.A.E., A, viii, 189; ix, 325] is considered 

 to have been proved, though some details are still in the experimental 

 stage. Directions are given, however, for the application of this 

 remedy. 



Goodwin (W. H.). Heat for Control of Cereal Insects. — Ohio Agric. 

 Expt. Sta.. Wooster. Bull. 354, January 1922, 18 pp. 



The usual method of destroying insects in stored grains and mill 

 products by means of heat is described, being based on the heating 

 plants installed in more than 30 mills in the States of Ohio and Penn- 

 sylvania. It is considered that heat can be successfully used for the 

 destruction of susceptible insects on hardy plants, to kill weevils in 

 nuts, and for pests infesting dried fruits, beans, peas, etc. The germina- 

 tion of most seeds is not interfered with by heating them sufficiently 

 to destroy the insects in them. Four formulae are given for calculating 

 the amount of radiation surface required for a steam heating plant 

 designed for killing insects. The greatest success will be obtained by 

 carrying out the process on a warm, dry day in summer. 



Crosby (C. R.) & Leonard (M. D.). Insects that hunt the Rose. — 



Amer. Rose Annual. Amer. Rose Soc, Harrisburg, Pa.. 1922, 

 pp. 89-100, 8 figs. [Received 12th April 1922.] 

 A short account is given of the chief insect pests of roses in America, 

 with useful notes on suitable remedies for each. Among those dealt 

 with are the sawflies, Endelomyia rosae. Harr. (American rose slug), 

 Cladiiis pectinicornis, Fourc. (bristly rose slug) and Emphytus cinctus. L. 

 (coiled rose slug), for which the remedies are a strong jet of water or the 



