Integration between Salicylic Acid as an Inducer of Plant-Induced Systemic Resistance and Insecticides for Bemisia tabaci Management on Squash (Cucurbita pepo, L.) | ||||
| Journal of Basic and Environmental Sciences | ||||
| Contributors, Volume 7, Issue 2, April 2020, Page 99-106 PDF (250.19 K) | ||||
| DOI: 10.21608/jbes.2020.371462 | ||||
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| Authors | ||||
| Manal A. Attia* 1; Mona A. A. Mohamoud2; Dalia A. El-Deeb3; M.S. Shawir4 | ||||
| 1nsecticide Bioassay Department, Central Agricultural Pesticides Lab. (CAPL), Agriculture Research Center (ARC), 21616, Alexandria, Egypt | ||||
| 2Plant Protection research Institute), Agriculture Research, Center (ARC), Alexandria, Egypt | ||||
| 3Insecticide Bioassay Department, Central Agricultural Pesticides Lab. (CAPL), Agriculture Research Center (ARC), 21616, Alexandria, Egypt | ||||
| 4Pesticide Chemistry and technology Department, Faculty of Agriculture, Alexandria University, Elshatby,Alexandria, Egypt | ||||
| Abstract | ||||
Salicylic acid (SA), an inducer of systemic acquired resistance (SAR), was foliar applied (0.7 g L-1 ) on two squash varieties (Alexandrian, and Hollar) to investigate the integration between SAR and insecticides (thiamethoxam or pymetrozine) on Bemisia tabaci management. Insecticides were applied at their recommended [FR] and half recommended field [HFR] rates separately or in sequence with SA. The Filed experiments were carried out in September and October during two subsequent successful seasons. In the first season, the sequential treatment SA&thiamethoxam [FR] presented significantly higher initial reduction (24h after treatment) of B. tabaci adults on Alexandrian (88.5 %) and Hollar (80.3%) varieties, compared with the other treatments. Conversely, the sequential treatment SA&pymterozine [FR] on Hollar variety was the most effective against the immature stages (82.4%), While on Alexandrian variety the highest reduction was obtained with the sequential treatment of SA&thiamethoxam [FR] (78.7%). Moreover, on both varieties no significant differences were recorded between the sequential treatments of SA&thiamethoxam [HFR] or SA&pymterozine [HFR] and each insecticide alone at the recommended rate. Furthermore, along 10 days of treatment a significant high reduction of adults was recorded with the sequential treatment of SA&thiamethoxam [FR] on both squash varieties. In the second season, similar trend was obtained, the highest reduction of adults was recorded with the treatment of SA&thiamethoxam [FR] on both (Alexandrian 84.1%) and (Hollar 76.3%). As well, the sequential treatments of SA&thiamethoxam [FR] and SA&pymterozine [FR] showed high reduction of adults along 10 days of treatment. Regarding to the immature stages on both squash varieties, high average of initial reduction and reduction along 10 days of treatments were recorded with all the sequential treatments compared with the individual treatments. On Alexandrian, the significant highest reduction recorded with SA&pymterozine [FR] (86.2%), while on Hollar recorded with SA&thiamethoxam [HFR] (60.9%). These results disclose the synergistic effect of SA that affected both tested insecticides efficacy and persistence. Therefore, SA could be recommended in sequence with low rates of insecticides for whiteflies management to reduce both rate and numbers of insecticides application which is in highly demand. | ||||
| Keywords | ||||
| Salicylic acid; systemic acquired resistance; thiamethoxam; pymetrozine; whiteflies management; environmentally friendly alternatives | ||||
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