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| Preliminary Effects of 4 Resistance Inducers on Tomato Resistance to Late Blight |
| LI Shao-bo1，2，SHI Yan-xia2*，LIU Jun-li1，XIE Xue-wen2，LI Bao-ju2* |
| 1Shenyang Agricultural University， Shenyang 110866， Liaoning， China； 2Institute of Vegetables and Flowers，Chinese Academy of Agricultural Sciences， Beijing 100081， China |
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Abstract In order to identify the resistance of tomato to late blight（ Phytophthora infestans）induced by benzothiadiazole，lentinan，chitosan and amino-oligosaccharin，this study determined the bacteriostatic activity of the above 4 elicitors．The results showed that these 4 elicitors had no significant bactericidal activity，and their inhibitory effects were generally less than 30%. The results of pot experiment indicated that the effects of induced resistance of these 4 elicitors with different concentrations against tomato in seedling stage were good．Among them，2% chitosan（ AS） at concentration of 500 mg·L-1 was 90.06%，which has the best control efficiency．The results of field experiment indicated that the effects of induced resistance of these 4 elicitors with different concentrations against tomato late blight in adult-plant stage were over 70%（ except the treatment of 2% chitosan AS at concentration of 125 mg·L-1）．The better treatments were 1% benzothiadiazole（ EW）at concentration of 50 mg·L-1 and 3% amino-oligosaccharin AS at concentration of 100 mg·L-1．Their control efficiencies were 94.71% and 95.89%，respectively．
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Received: 16 March 2013
Published: 20 April 2013
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