Chemical control of root rot complex and stem rot of greenhouse cucumber in straw-bale culture |
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Institution: | 1. College of Life Sciences, Northwest A&F University, Yangling 712100, China;2. Shaanxi Key Laboratory of Natural Products & Chemical Biology, College of Science, Northwest A&F University, Yangling 712100, China;3. Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China;1. Institut FEMTO-ST/TF, Université Bourgogne Franche-Comté, 26 chemin de l’Epitaphe, 25030 Besançon Cedex, France;2. Institut FEMTO-ST/MN2S, Université Bourgogne Franche-Comté, 15 B avenue des Montboucons, 25030 Besançon, France;3. Institut FEMTO-ST/DMA, Université Bourgogne Franche-Comté, 26 chemin de l’Epitaphe, 25030 Besançon Cedex, France;4. Instytut Technologii Elektronowej, al. Lotnikow 32/46, 02-669 Warsaw, Poland;5. Fraunhofer IKTS, Maria-Reiche Str. 2, 01109 Dresden, Germany;6. Zhengzhou university of Light Industry, No. 5 Dongfeng Road, Zhengzhou, Henan Province, PRC. 450002, China |
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Abstract: | Experiments were conducted in three different commercial greenhouses wherein cucumber (Cucumis sativus L.) cv. Kalunga F1 (Long English type) were grown in composted straw bales, heavily infested with Fusarium oxysporum Schlechtend.:Fr. f.sp. radicis-cucumerinum Vakalounakis (FORC), the causal agent of Fusarium root and stem rot of cucumber. FORC was isolated from roots and stem bases of symptomatic plants either in single infections or simultaneously with other root infecting pathogens, including species of Phytophthora and Pythium and Rhizoctonia solani Kühn AG-4. Verticillium dahliae Kleb. was obtained from individual cucumber plants showing wilt symptoms. Fungicide applications started at the beginning of fruiting time when the first symptomatic plants occurred and followed at 45-day intervals. Three fungicides, either alone or as tank-mixed combinations of 0.1% Topsin M 70WP (thiophanate-methyl 700 g kg−1) plus 0.15% Previcur 607SL (607 g L−1 propamocarb hydrochloride), or 0.1% Benomyl 50WP (benomyl 50 g kg−1) plus 0.15% Previcur 607SL, were applied to the crown and root area of cucumber plants through drip irrigation systems as drenches at a rate of 0.25 L/plant. Plant mortality was reduced by 11.1%–84.8% and 23.8%–77.7% when plants were drenched with Topsin M 70WP in combination with Previcur 607SL or Benomyl 50WP plus Previcur 607SL, respectively. In comparison, significantly lower levels of disease control were achieved when these fungicides were applied individually. Three fungicide applications during the crop season increased the inhibitory effect of the fungicide regime on the disease incidence compared to one or two treatment. |
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