Abstract:

To prevent the occurrence and spread of wheat yellow mosaic virus disease, three wheat varieties, ‘Luyuan 502’, ‘Xinmai 296’ and ‘Qimin 8’ were tested for resistance to wheat yellow mosaic virus (WYMV) on two different sowing dates: October 20th and November 1st of 2021. The results showed that wheat yellow mosaic virus disease was asymptomatic in ‘Qimin 8’ sown on the two dates. And in ‘Luyuan 502’ sown on November 1st, the disease was asymptomatic too. However, the new leaves of ‘Luyuan 502’sown on October 20th showed chlorotic streaks or yellow mosaic symptoms. ‘Xinmai 296’ sown on the two sowing dates showed chlorotic streaks or yellow mosaic symptoms on most leaves, sometimes, the variety showed new leaf distortion, and the plant dwarfing was not obvious. Under the sowing date of October 20th, the highest yield was observed in ‘Qimin 8’ (8960.4 kg/hm²), followed by ‘Luyuan 502’ (8570.4 kg/hm²) and ‘Xinmai 296’ (8330.4 kg/hm²), and the average yield of the three varieties reached 8620.4 kg/hm². Under the sowing date of November 1st, the highest yield was found in ‘Qimin 8’ (8120.4 kg/hm²), followed by ‘Xinmai 296’ (6260.25 kg/hm²) and ‘Luyuan 502’ (6190.35 kg/hm²), and the average yield of the three varieties was 6857 kg/hm². The average yield of the three varieties sown on October 20th was 1763.4 kg/hm² higher than that on November 1st. The effect of reducing the incidence of wheat yellow mosaic virus (WYMV) could be achieved by the combination and improvement of technologies of wheat variety selection, soil improvement, late sowing, and fertilizer reduction and efficiency enhancement.

Key words: wheat yellow mosaic virus, variety, sowing date, resistance, yield