Herbicidal Activity and Safety to Crops of Alternaria alternata DT-DYLC

doi:10.16409/j.cnki.2095-039x.2023.02.016

Abstract

Abstract: Fungal strains were isolated from the leaves of naturally diseased plants collected from the farmland of Dalong Village, Datong County, Qinghai Province. Tne antagonistic strain DT-DYLC showed good herbicidal activities against Chenopodium album by detached leaves, greenhouse pot experiments and crop safety evaluation. The results showed that a large number of gray-white hyphae were observed at the inoculation site, and there was penetration growth on the reverse side of the leaves after 7 days of inoculation with DT-DYLC. The disease incidence rate was 60.04%, and the disease grade were 4. The spore suspension of strain DT-DYLC with different concentrations (1.20×10¹-1.20×10⁴spores/mL) had incidence of 50.35%-95.81%, disease index of 49.34- 89.44, and fresh weight control effecacy of 52.95%-83.25%. Crop safety evaluation of strain DT-DYLC showed that its spore suspension was safe to wheat, barley, corn, tomato and cucumber. DT-DYLC was identified as Alternaria alternata by morphology and rDNA-ITS sequence analysis. The above results provide a theoretical basis for the further field application of this strain.

Key words: weed, herbicidal activity, crop safety, biological control

CLC Number:

S476+.1

CHENG Haiyang, CHENG Liang, ZHU Haixia, LI Juan, WEI Youhai, GUO Qingyun. Herbicidal Activity and Safety to Crops of Alternaria alternata DT-DYLC[J]. Chinese Journal of Biological Control, 2023, 39(2): 418-428.

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