关键词: 诱抗剂, 西瓜, 小西葫芦黄花叶病毒, 防效

Abstract: In order to explore plant immunoinducer with control effect to watermelon virus disease，taking zucchini yellow mosaic virus（ZYMV）as control object，plant pathogenicity and relative control efficiency as indicators，this paper evaluated 6 agents with different concentrations，including picolinic acid（Pip），N-hydroxy-picolinic acid（NHP），gallic acid，benzothiadiazole（BTH），chitosan，β-aminobutyric acid（BABA），and their two-agent and three-agent combinations for their control effects on this virus disease．The results showed that the control effect of single-agent on ZYMV in watermelon ranked from high to low as follows：NHP（0.5 mmol·L-1），Pip（2 mmol·L-1），chitosan（1 g·L-1），gallic acid（0.5 g·L-1），BABA（1 mmol·L-1），BTH（0.1 mmol·L-1）．In the combination agent experiment，the best control effect of the twoagent combination was 2- Ⅶ（NHP 0.5 mmol·L-1 + Pip 2 mmol·L-1）．Eleven days after inoculation，when incidence rate of the plant by control-treated water reached 100.00%，the incidence rate of the combinationtreated plants was 10.00%，and relative control effect was 89.99%．However，this combination agent would affect plant growth．The combination of 3 agents with better control effect were 3-Ⅰ（gallic acid 0.5 g·L-1 + NHP 0.5 mmol·L-1 + BABA 1 mmol·L-1）and 3- Ⅱ（gallic acid 0.5 g·L-1 + NHP 0.5 mmol·L-1 + Pip 2 mmol·L-1）．Their incidence rates were 27.27% and 33.33%，respectively，and their relative control effects were 79.49% and 68.27%，respectively，significantly higher than those of the other combinations．Among them，the incidence rate of the plants treated with 3-Ⅱ increased slowly，and disease control effect was more lasting than that of the other treatments．Thus，3-Ⅶ had the best control effect on ZYMV．The results indicate that NHP，Pip and gallic acid had potential application value in preventing watermelon virus diseases．

Key words: resistance inducer, watermelon, zucchini yellow mosaic virus, control effect