Published in Scientific Papers. Series B, Horticulture, Volume LX
Written by Ana Emilia CENUŞĂ, Gabriela ŞOVĂREL, Marcel COSTACHE, Elena BRATU, Marius VELEA
Experiment was performed in the summer of 2015, in a cucumbers crop under high plastic tunnel conditions in order to determine the efficacy of some bio-insecticides in the control of two spotted spider mites (Tetranychus urticae) attack. Bio-products Oleorgan - 0.3% (saponified neem oil 40%), Konflic - 0.3% (Quassia amara 50%+saponified extract of different oils 50%), Canelys – 0.3% (cinnamon extract 70%), Kabon – 0.3% (potassium soap from vegetable oils 50%), Zicara – 0.15% (citrus peel extract and essential oils 70%), Lasser 240 SC – 0.05% (spinosad 24%) and Vertimec 1.8 EC – 0.08% (abamectine 1.8%) were applied single or mixed, repetitive or alternated in different variants. Were performed 6 applications. Intervals between treatments decreased from 7 to 3-4 days, depending of pest infestation level. Percent of attacked area/leaf and attack/plant established by visual estimation, and the harvest/plant were registered at the end of crop vegetation cycle. In addition, for a better appreciation of obtaining results were calculated the average attack and production increasing. Analyzing of the all parameters take into account showed that the most relevant of them proved to be the average attack (noticed as “general attack”), harvest/plant and harvest increasing. Yield data were statistical assured. Based on these parameters, best results (6.1%, 3.914 kg, and 224.8%, resp.) were obtained with a combination of spinosad 24% and abamectine 1.8% applied alternate. Appropriate values (6.4%, 3.076 kg, and 176.7%, resp.) were registered with product Oleorgan based on saponified neem oil 40%. Relatively good results (17.7%, 2.504 kg, and 143.8%, resp.) have been obtained by applying a mixture containing Oleorgan + Kabon + Canelys (0.3% each) alternately with another mixture: Konflic + Canelys + Zicara (0.3%; 0.3%; 0.15%). In the cases of spinosad 24% and untreated check, the three parameters take into account presented values of 75 and 92.5% resp., 2.248 and 1.741 kg, resp., and 130.8% (untreated check was reference). The study revealed that the saponified neem oil 40% applied alone had lower but appropriate performances to those of spinosad and abamectine alternately applied, proving a high acaricidal action, which promote it to be used in IPM and organic farming practices.
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