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Field evaluation of citrus germplasm for resistance to the black aphid, Toxoptera aurantii (Boy.) Under tropical humid south Indian conditions*

  • B.S. Bhumannavar (a1), S.P. Singh (a1) and V.V. Sulladmath (a1)

Abstract

Studies on relative susceptibility of 78 citrus varieties/hybrids to the incidence of black citrus aphid, T. aurantii under tropical humid conditions in south India revealed that none of the varieties was completely free from aphid incidence. The varieties Nagpur Mandarin and Ikeda Unshiu among mandarins; Longsport Valencia, Campbell Valencia and Washington Navel among sweet oranges; and Carrizo Citrange a hybrid and Dessert Orange, Eureka Lemon, Grape Fruit Pink and Jatti Khatti, among acid citrus group, recorded significantly least mean number of aphids per flush and can be effectively used in breeding programmes.

Nous avons conduits les etudes sour la sensibilite relatife des 78 varieties/hybrids pour l'incidence des pueerons noirs du citron T. aurantii, sous les conditions humides tropicales en Inde du sud. Les resultats montrés qui il nya pas de variétè qui est totalment resistance sux ravageurs. Comme même, nous avons comptés moindres nombres des pucerons par floraison chez les variétiès Nagpur Mandarin et Ikeda Unshiu parmis les mandarins; Longsport Valencia, Campbell Valencia et Washington Navel parmis les oranges sueres; Carrizo Citrange un Hybrid; et Dessert Orange, Eureka Lemon, Grape fruit pink et Jatti Khatti parmis les citrons acidés. Ainsi, nous pouvons effectivement utiliser ces variétiès dans les programmes diamé lioration des citrons.

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References

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Capoor, S.P. and Rao, D.G. (1967) Tristeza virus infection of citrus in India. Proc. Int. Symp. Sub-trop. and Trop. Hort., Hort. Soc. India, New Delhi, pp. 723736.
Bindra, O.S. (1970) Citrus Decline in India, Causes and Control—IX. Insects. Publ. of PAU-OSU-USAID, Ludhiana, Punjab, India. pp. 6478.
Ramani, S. (1979) Reaction of soybean (Glycine max (L.) Merrill) germplasm to the leaf miner Biloba subsceivella (Zeller) (Lepidoptera: Gelechiidae). M. Sc. Thesis, University of Agricultural Sciences, Hebbal, Bangalore.

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