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

摘要： 为探索对西瓜病毒病具有防效作用的植物免疫诱抗剂，以小西葫芦黄花叶病毒（zucchini yellow mosaic virus，ZYMV）为防治对象，植株的显症率及相对防效为指标，评价了6 种不同浓度的哌啶酸（Pip）、N- 羟基哌啶酸（NHP）、没食子酸、苯并噻二唑（BTH）、壳寡糖、β– 氨基丁酸（β-aminobutyric acid，BABA）及其2 种药剂和3 种药剂复配后对该病毒的防治效果。结果显示，单一药剂喷施后对西瓜ZYMV 的防效从高到低依次为：NHP（0.5 mmol·L-1）、Pip（2 mmol·L-1）、壳寡糖（1 g·L-1）、没食子酸（0.5 g·L-1）、BABA（1 mmol·L-1）、BTH（0.1 mmol·L-1）；复配药剂试验中，2 种药剂复配防效最好的是2-Ⅶ（NHP 0.5 mmol·L-1 + Pip 2 mmol·L-1），接种后11 d、无菌水对照植株显症率达到100.00%时，该组合处理的植株显症率为10.00%，相对防效达89.99%，但该复配药剂会影响植株生长；3种药剂复配防效较好的组合是3-Ⅰ（没食子酸0.5 g·L-1 + NHP 0.5 mmol·L-1 + BABA 1 mmol·L-1）和3-Ⅱ（没食子酸0.5 g·L-1 + NHP 0.5 mmol·L-1 + Pip 2 mmol·L-1），显症率分别为27.27%、33.33%，相对防效分别为79.49%、68.27%，显著高于其他组合，其中3-Ⅱ处理的植株显症率增加缓慢，防病效果较其他处理持久，防治效果最优。综上，NHP、Pip和没食子酸3种诱抗剂在预防西瓜病毒病害中具有潜在的应用价值。

关键词: 诱抗剂, 西瓜, 小西葫芦黄花叶病毒, 防效