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r/iaBHtniuie Bonpocbi, nociynnBiuie bi. LleHTpanbHyio cDHTonaiojio- 

 rMMeCKyK) CiaHUiK) 3a 1913 rofllj. [The principal queries received 

 at the Central Phytopatliological Station in 1913.] — « EoJI'tSHll 

 PaCTeHiM.» [Diseases of Plants], Petrograd, viii, no. 2-3, 1914, 

 pp. 89-107. 



This is a list of queries addressed to the Station during 1913 and of 

 some of the remedies suggested in reply. Apricots were attacked 

 at the roots by larvae of Anoxia pilosa, F, Poisoning the soil with 

 carbon bisulphide, Paris green and iron sulphate, covering the soil with 

 straw during the time the beetles are on the wing, and catching 

 and killing the adults, were advised. The leaves were attacked 

 by Tetranychus telarius, L., against which repeated dusting with 

 flowers of sulphur or spraying with soapy water (10 lb. of soap in 27 

 gallons of water), and in autumn, collection and burning of the fallen 

 leaves, and brushing with an oiled rag the bottoms of the trunks and 

 the forks of the branches where the mites winter, were recommended. 

 Oranges were damaged by Lepidosaphes pinnaeformis, Chrysoniphalus 

 dictyospermi and Tetranychus pilosus, the usual remedies being 

 suggested. Birches were infested with Scolytus (Eccoptogaster) 

 ratzehurgi ; remedies : felling of the damaged trees and burning their 

 bark ; trap trees. Vine roots were damaged by Polyphylla fidlo, L. ; 

 preventive remedies consist in burying naphthalin in the soil, during 

 the oviposition period. Cherry leaves were skeletonised by the 

 sawfly, Eriocampoides limacina {Selandria adumhrata), against which, 

 spraying with insecticides and turning over the soil is suggested ; and 

 against Myzus cerasi spraying with kerosene emulsion is recommended. 

 On elms, galls on the leaves were caused by Pemphigus pallidus and 

 Schizoneura lanuginosa ; spraying with soapy water or washing the 

 trunks with 2 per cent, copper sulphate was advised. Blueberries 

 were infested with Cliionasjns salicis. Pear trees were injured by 

 Aphis pyri — remedies : spraying with kerosene emulsion, tobacco 

 extract, and quassia decoction ; by Psylla pyricola — remedies : three 

 sprayings with kerosene emulsion or tobacco powder in water (2| lb. 

 of tobacco in 27 gallons of water) ; fumigation with tobacco smoke ; 

 Tingis pyri — remedies : repeated sprayings with kerosene emulsion ; 

 Eriophyes pyri, Pagst. — remedies : the collection and destruction of the 

 damaged leaves ; in March, spraying with kerosene emulsion. Blossoms 

 were attacked by adults of the Elaterid, Limonius minutus, L. ; 

 remedies : the collection and destruction of the beetles. Willow trees 

 suffered from the galls of the Cecidomyids, Rhahdophaga heterobia, Lw., 

 and R. clavifex, Kieff., and the leaves were injured by Galeruca 

 (Adimonia) capreae. Clover blossoms were attacked by Anthothrips 

 acxdeatus, and by Apion apricans. Gooseberries were injured by 

 larvae of Aegeria {Sesia) tipidiformis, and raspberries by Bemhecia 

 hylaeiformis and Byturus fumatus. Lemons were attacked by 

 Tetranychus pilosus, Lepidosaphes pinnaeformis and Chrysomphalus 

 dictyospermi. 



In larch trees, the needles were infested with larvae of Coleophora 

 laricella. The young shoots of silver fir, Picea pectinata, were attacked 

 by caterpillars of Enarmonia (Grapholitha) rufimitrana, U.S., and the 

 needles damaged by Dreyfusia pectinatae, Chldk. ; remedies : cutting 

 and burning of the heavily infested shoots, spraying with kerosene 



