134 



the hybrids offering more or less resistance to Phylloxera. The species 

 tliat were crossed and the principal strains in various parts of Spain 

 are discussed. In 1918 the author was requested to visit the vinej'ards 

 of la Rioja where damage from Phylloxera was recorded on the grafted 

 vines, and it was found that these hybrids had proved non-resistant 

 to a fresh invasion of the insect. In France the climate is somewhat 

 less favourable to the rapid multiplication of this Aphid than that of 

 Spain, but it is most likely that a similar recrudescence of infestation 

 will occur there. An examination of some of the vineyards of Cognac 

 has shown that some hybrids, in particular that known as 1202, 

 have perished owing to attacks of Phylloxera. It is not suggested that 

 the grafting of French and American vines has proved a failure, but 

 that it should be undertaken with due precaution. The so-called 

 resistance of certain French-American hybrids may have gained its 

 reputation merely owing to a temporary abatement of the Phylloxera 

 infestation, and this reputation ma}' soon be destroyed b}' a fresh 

 outbreak of the pest. 



Thompsox (W. R.). l.S. Bur. Entom. Sur une Tachinaire Parasite de 

 la Larve de Phytonomus posticus, Gyll. — Bull. Soc. Vulg. Zool. 

 Agric, Bordeaux, xix, no. 11-12, November-December 1920, 

 pp. 116-121. 



Tachinids have previously been observed parasitising the larvae of 

 several species of Chr^^somelids, including Crioceris, Galerucella, Lina, 

 Gastrophysa, Cassida, etc., and new hosts are continually being recorded. 

 The apodous larvae of Hyper a {Phytonomus), which were most 

 probably originally subterranean or inhabitants of galleries and were 

 then parasitised exclusively by Hymenoptera, have adapted themselves 

 to the leaves of clo\'er and lucerne, and are therefore exposed to the 

 attack of Tachinids. One instance has in fact been observed of a larva 

 oi Hypera variabilis, Hbst. {Phytonomus posticus, Gyll.) being parasitised 

 by a Tachinid that unfortunately died after completing its larval 

 development and emerging from the body of its host. It seemed to be 

 closely allied to, if not identical with, Tachina impotens, Rond. 



Travers (W. C). Report of Dusting Investigations. — Trans. Peninsula 

 Hort. Soc. [Delaicare], ix, no. 3, 1920, pp. 39-44. (Abstract in 

 Expt. Sta. Record, Washington, B.C., xliii, no. 8, December 1920, 

 p. 743.) 



Co-operative dusting experiments were conducted in 1919 on the 

 Eastern shore of Maiyland, using a dust mixture of 85 per cent, sulphur 

 and 15 per cent, lead arsenate in dusting apples, peaches, and straw- 

 berries. As compared with a lime-sulphur spray, dusting was fairly 

 satisfactory in controlling insects, but was far from satisfactory in 

 controlling apple diseases. It failed to control peach scab and curculio 

 [Conotrachelus nenuphar], but was successful in controlling brown rot. 

 The dust killed the weevils, but not until after they had punctured the 

 fruit. The cost of dusting was greater than that of spraying, both with 

 apples and peaches. 



Dusting experiments for the control of the strawberry weevil 

 [^w//zoMom«s si'o'«a/;/s J were highly successful and profitable, a mixture 

 of 85 per cent, sulphur and 15 per cent. lead arsenate giving the best 

 results. 



