365 



Maarschalk (H.). Pestrijding van de Bessenbastaardrups. [Measures 

 against the Larvae of Pteronus ribesU.] — Tijdschr. Plantenziekten, 

 Wageningen, xxv, no. 3, May 1919, Bijblad pp. 13-16. 

 Experiments with barium chloride have shown that a solution with 

 a strength of 1^^- per cent, destroys the larvae of the currant sawfly, 

 Pteronus rihesii. Scop., while doing no injury to the bushes. It is 

 however dearer than Paris green, easily washed ofi by rain, and 

 colourless, so that it is not possible to see where the spray has been 

 applied. This last disadvantage can be obviated by adding about 

 ^ part of lime to 100 parts by weight of water to the spray applied 

 when the bushes are in blossom. Against the second generation of 

 larvae the solution should be used without lime, as the fruit is then 

 on the bushes ; this application should be made at least one week 

 before gathering the fruit. The danger of poisoning is very remote, 

 barium chloride being far less toxic than arsenicals. 



RoLET (A.). Traitement simultan§ de la Cochenille, de la Fumagine et 



du Cycloconium des Oliviers. — Jl. d'Agric. Pratique, Paris, xxxii, 



no. 20, 19th June 1919, pp. 413-415. 



The various sulphur sprays for simultaneous treatment of the 



insects producing honey-dew, such as Saissetia {Lecanium) oleae, etc., 



and of the fungus diseases encom'aged by its presence, as well as Daciis 



ol?ae which is attracted by it, are reviewed. The formulae preferred 



in various countries are discussed and the recommendations for the 



use of polysulphides by del Guercio [see this Review, Ser. A, iii, p. 430] 



and by Savastano [he. cit., ii, p. 412] are given. 



Reports on the State of the Crops in each Province of Spain on the 20th 

 May 1919. — Bol. Agric. Tecnica y Economica. Madrid, xi, no. 125, 

 May 1919, pp. 426-442. 

 Aphids have done much damage to vegetable crops, particularly 

 in bean-fields in Castellon, and also to almonds in certain localities ; 

 for the latter a spray is recommended of 1^ per cent, each of soft soap 

 and petroleum in water. The caterpillars of Tortrix viridana have 

 attacked oaks in Cordoba, but the damage is decreasing and it is 

 hoped that the acorn crop will be normal ; in Huelva, however, oak 

 pests have been more severe and it is feared that the acorn-crop, which 

 is locally valuable for feeding pigs, will be worthless. Barley and 

 wheat in Cordoba have suffered from the attacks of a bug, Aelia 

 rostrata. Locusts have also appeared in some localities of this Province, 

 and in Huelva, where materials for remedial measures are lacking. 

 In the Province of Madrid locusts have invaded certain districts in 

 large numbers and a campaign has been undertaken by the military 

 authorities under the direction of the Board of Agriculture, with the 

 small allowance of materials available. In Lerida Aphids have been 

 extraordinarily abundant in bean-fields and orchards, probably 

 owing to the unusually mild winter. 



SiE^LER (E. H.). A Brief Analysis of the Dusting Method. — Bept. 



Maryland Agric. Soc, College Park, Md., ii (1917), 1st March 



1918, pp. 86-98. [Received 25th June 1919.] 

 Experiments made in the United States to control pests of apples 

 and peaches by means of the dusting method are still being continued. 



