A Case For Induced Mutation In Chickpea For Ascochyta Blight Resistance

Chickpea (Cicer aria tin at L.) is an important grain leguae grown in several coiaitries. Blight caused by Ascochyta rebiol (Pass] Labrousse Is widespread and results In considerable losses in several countries (2, 5, S, 8, 11, 12, 14, IS, 17, 19, 22, 26, 29, 30, 51, 33, 35, 36, 38, and 40). Extensive efforts have been aade by earlier workers to identify resistance sources and aaniadxe losses through the development of resistant/tolerant varieties (1, 4, 6, 7, 9, 13, 16, 20 21, 23, 2S, 28, 34, 36, and 38). Host of the screening work has been carried out in fields, either in areas where natural epiphytotics occur or through artificial field inoculations in areas where the disease is not always severe (13, 16, 24, 25, 32, and 37)

Influence of sterility mosaic resistant pigeonpeas on multiplication of the mite vector

Pigeonpea lines resistant to the causal agent of sterility mosaic did not permit continued multiplication of its eriophyid mite vector, Aceria cajani. Resistance to the causal agent and lack -of continued multiplication of the mite vector on these lines are expected to provide greater stability of resistance to the disease...

Preliminary information on chickpea stunt

The name chickpea stunt is introduced for a disease of Cicer arietinum that is described from Andhra Pradesh, and occurs at various other places in India, and in Turkey and Iran. Attempts to transmit the causal agent through sap, graft and dodder failed, but it was repeatedly transmitted in the laboratory by the aphid Aphis craccivora Koch. After acquisition feeding periods of from 0.5 h to 4 days and inoculation feeding periods of 48 h, symptoms developed in test plants after 20-45 days, the success in transmission varying from 25 to 80%.ADDITIONAL ABSTRACT:A condition in chickpeas called 'wilt complex' and now named chickpea stunt, prevalent in central and N. India, caused fewer pods to develop/plant and a reduction in seed yield of up to 80%/infected plant. Possible causes of chickpea stunt are discussed; it can be transmitted by Aphis craccivor

Chickpea diseases: Resistance-screening techniques

More than 50 pathogens have been reported to affect chickpea (Cicer arietinum L.), an important legume crop in many parts of the tropics and subtropics. Several pathogens are of economic importance, particularly wilt, dry root rot, and Ascochyta blight. To assist plant breeders to develop disease-resistant material, techniques have been worked out and standardized at ICRISAT to screen germplasm and breeding material on a routine basis. These techniques are described in detail, with ten color illustrations, and a nine-point rating scale is given to facilitate the identification of resistant breeding material

Modified infector-row technique to screen pigeonpea for sterility-mosaic resistance

This technique, known as the infector-hedge system, was found to be more convenient than the infector-row method for large-scale field tests. A four-rowed hedge of susceptible Cajanus cajan 'NP(WR)15' was planted along one side of a 2 ha field and infected by leaf-stapling with infected material. Average disease incidence across the field in indicator rows of susceptible BDN1 (planted every ten rows between test materials) was 98.7% at 104 days after plantin