Practical Achievements in Insect Resistance Breeding
Insect resistant varieties have been developed in many crops. Phylloxera resistant varieties of grapes have been developed in France though the use of resistant root stocks introduced from U.S.A. In USA, Hessain fly and stem sawfly were the serious insect pests of wheat. More than 23 Hessain varieties have been developed. These varieties are successfully grown in Hessian fly prone areas of USA. Stem sawfly resistant variety ‘Rescue’ with solid stem was released from Canada in 1946. this variety is successfully grown in stem sawfly , prone areas in USA and Canada. In Maize, resistant varieties to rust have been released and maize rust is no longer a serious disease in U.S.A. a barley variety ‘Will’ resistant to green bugs has been developed in USA. Cultivation of this variety has reduced the population of greenhouse to 50%. Alfalfa varieties ‘Cody’, Mopa and Zia, developed in USA, are resistant to spotted alfalfa aphid. Oat variety, ‘Greta’ developed in Belgium is resistant to stem eelworm.
In cotton varieties, B-1007, SRT1, Khandwa2, DHY 286, PKV 091, evolved in India are resistant to Jassids. These varieties are successfully grown in Central India. Cotton varieties, Kanchana, Supriya, and LK861 are tolerant to whitefly. Insect resistant varieties have been developed in many other crops. For example, in raspberry to aphid, in lettuce to root aphid, in apple to wolly apple aphid, in grape to Phylloxera , etc.