Control effects of nano-grade copper 80% Bordeaux mixture wettable powder on leaf spot diseases of tobacco

doi:10.14088/j.cnki.issn0439-8114.2023.11.011

Abstract

Abstract: A new pesticide, nano-grade copper 80% Bordeaux mixture wettable powder, was used as the test agent and conventional 80% Bordeaux mixture wettable powder was used as the control agent. Field control experiments were carried out in Kaiyuan City and Fengcheng City of Liaoning Province for two years for 4 major leaf spot diseases of tobacco, including angular spot, wild fire, target spot and brown spot diseases. The results showed that compared with the conventional 80% Bordeaux mixture wettable powder, the nano-grade copper 80% Bordeaux mixture wettable powder had a better control effect on tobacco angular spot, wild fire, target spot and brown spot diseases. The dosage of 1 050 g/hm² was applied twice continuously, and the best control effects were 75.61%, 76.90%, 81.35% and 60.71%, respectively. In order to verify the safety of nano-grade copper 80% Bordeaux mixture wettable powder, the agronomic characteristics of tobacco plants were investigated in Kaiyuan City experimental field. The results showed that the plant height was 118.12 cm, the stem circumference was 9.11 cm, the effective leaf number was 21.51, and the max leaf area was 2 487.18 cm², which were all slightly higher than those of the control agent, and this new pesticide had no adverse effect on the growth and development of tobacco plants.

Key words: nano-grade copper, Bordeaux mixture, leaf spot diseases of tobacco, control effects, agronomic characters

CLC Number:

S435.72

MA Xin, KOU Bao-shi, LI Ji-bo, PENG Chao, LIU Qian-wen, GAO Meng-meng, ZHANG Chong, GU Ming. Control effects of nano-grade copper 80% Bordeaux mixture wettable powder on leaf spot diseases of tobacco[J]. HUBEI AGRICULTURAL SCIENCES, 2023, 62(11): 60-64.

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