Seed Transimssion of Ascochyta fabae F. Sp. Lentls in Lentil and its Contol with Fungicides
1992
Seid Ahmed | Beniwal, S.P.S
Seed infection of Assochyta fabae f. sp. lentis Gossen et al. was established in Ethiopian lentil seeds by blotter and agar plate methods. In one seed lot the two methods gave results of 8.5 and 20.1 percent, respectively. The fungus produced abundant pycnidia on agar plates. Seeds transmission was also established through growing-on tests; transmission frequency was 12 and 2.5 percent in test tube and greenhouse tests, respectively. Infection in different lentil genotypes ranged from 0 to 7 percent, depending upon the seed source. Seed infection was higher in lentil accessions that showed higher ascochyta disease ratings in field screenings; it ranged from 0.5 to 6.5 percent. 8.5 to 10 percent and 10.5 percent in accessions showing field ratings of 3, 5, and 7 (out of 9), respectively. Fungicides; thiabendazole, benomyl and a mixture of tridemorph + maneb (Calixin M) at 50, 100 and 150 ppm completely inhibited in vitro growth of Ascochyta, whereas carboxin was only partial-inhibitory. Transmission of A. fabae f. sp. lentis to lentil seedlings was completely checked by benomyl and thiabendazole seed treatments.
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