158 



from South Africa — from the fruit of Olea verrucosa, and the branches 

 of Morns alba infested by Diaspis — and from Brazil, also from .1/. alba 

 infested by Diaspis. 



^tlAxciiERON (P.). Ennemis et Maladies de la Betterave a Sucre.— 



Rev. Agric. Afr. Nord, Algiers, xix, no. 77, 21st January 1921, 

 pp. 56-58. 



The insect pests of sugar-beet mentioned are Atomaria linearis, 

 common in the whole of North Africa ; the larvae of Melolontha and 

 Agriotes ; Grvllotalpa ; Nematodes ; Haliica, common in Algeria, 

 where it also attacks vines ; and Silpha. Nematodes are considered 

 to be the most important. 



Habermehl ( — ). Beitrage zur Kenntnis der palaearktischen Ichneu- 



monidenfauna. [Contributions to tlie Knowledge of the Palae- 

 arctic Ichneumonid Fauna.] — Zeitschr. tciss. Insektenbiol., Berlin, 

 xvi, no. 3-4, 31st December 1920. pp. 63-69. 



This is an addendum to the paper under the same title already 

 noticed [i?. .■!.£., A, ix, 36]. 



EscHERiCH (K.). Angewandte Entomologie. [AppUed Entomology.] 

 ■ — Reprint from Aus der Xatitr, xvii, no. 1, pp. 7-10. [Received 

 28th January 1921.] 



An impression exists that the systematic determination of an injurious 

 species is the duty of the zoologist, whereas combative measures 

 come within the province of the agriculturist or agricultural botanist. 

 This idea must be combated energeticaUy. All the striking successes 

 in pest control throughout the world have been achieved by applied 

 zoologists or applied entomologists. The reason why German forestry 

 has been so successful is that from the beginning zoologists have studied 

 the forest insects. On the other hand, pest control in German agri- 

 culture has suffered because of the erroneous idea mentioned above. 



This article also pleads for thorough co-operation between zoologists, 

 botanists, chemists, soil-experts, and practical agriculturists. Such 

 co-operation is necessary if agricultural pests are to be mastered. 



MiEGE (E.). Action de la Chloropicrine sur la Faculte germinative 

 des Graines. — C. R. hebdom. Acad. Sci., Paris, clxxii, no. 3, 

 17th January 1921, pp. 170-173. 



Observations made to test the action of chloropicrin on the germina- 

 tion of plants show that the effect varies with the kind of plant treated, 

 as well as with the strength and length of treatment. Whilst legu- 

 minous plants are practically immune to the action of the gas, hemp, 

 beetroot, and especially cereals, are greatly affected. The germinative 

 power of wheat may be reduced by at least 30 per cent, as a result. 



March AL (P.). Utilisation des Coccinelles contre les Insectes nuisibles 

 aux Cultures dans le Midi de la France.— C. R. hebdom. Acad. 

 Sci., Paris, clxxii, no. 2, 10th January 1921, pp. 105-107. 



Colonies of Cryptolaemiis montrouzieri , Muls., predaceous on Pseudo- 

 coccus spp., have been bred and liberated from the insectarium at 



