Field Testing of Efficacy of Three Environmentally Friendly Insecticides Against Colorado Potato Beetle (Leptinotarsa Decemlineata [Say], Coleoptera, Chrysomelidae) on Potato-Evaluation of the Effect on Yield

Abstract

In 2007 and 2008 the field experiment was conducted to test the efficacy of three environmentally friendly insecticides against the Colorado potato beetle (Leptinotarsa decemlineata), with the aim of evaluating their effect on the yield of potato. 0.25 % water emulsion of Neem-Azal (active ingredient azadirachtin) was applied twice, while 3 % water emulsion of Aktiv (a.i. potassium salt of fatty acids) and 1 % water emulsion of Prima (a.i. refined rape oil) were applied eight times. In 2007, the potato yield was higher (25.3±3.2 t ha -1 ) than in 2008 (8.2 ± 0.8 t ha -1 ). In 2007 there were no significant differences in potato yield at different control measures and the yield ranged from 7.5 ± 1.3 t ha -1 (Aktiv) to 9.4 ± 1.8 t ha -1 (Prima). In 2008, the highest potato yield was recorded in Neem-Azal treatment (3.5 ± 0.7 t ha -1 ), while in two other insecticide treatments the potato yield did not differ significantly with control treatment neither with the Neem-Azal treatment. Potato tubers were classified into three fractions: fraction 1 (tubers <4 cm), fraction 2 (tubers between 4 and 5 cm), and fraction 3 (tubers > 5 cm). On average we produce 2.11 ± 0.06 t ha

Evaluation of Biorational Insecticides as Stand-alone Treatments for the Management of the Pigweed Flea Beetle, Disonycha glabrata (Coleoptera: Chrysomelidae), in Organic Production of Amaranthus spp.

“…This may be related to extreme lodging of some plants that occurred in 2018 when inclement weather conditions (high rainfall and wind) prevailed in the study area. That notwithstanding, the results of our study reaffirm that use of biorational insecticides has the potential to impact amaranth yield (Laznik & Trdan, 2017;Balusu & Fadamiro, 2012). PyGanic ® ; Entrust ® and Ecotec ® -treated amaranth recorded higher yields in both 2017 and 2018 than did Azatin ® O and the unsprayed control.…”

“…Despite these achievements, their use has become a serious global concern due to the high toxicity to humans and a disruption in ecosystem processes (Showler, Greenberg, & Arnason, 2004;Overall, 2008). Biorational insecticides cause less environmental harm while providing effective management of crop pests (Showler et al 2004;Overall, 2008;Leskey, Lee, Short, & Wright, 2012;Laznik & Trdan, 2017;Iwuagwu et al, 2019;Muralikrishna et al, 2019). The results from this study confirm the effect of OMRI-approved insecticides in the management of D. glabrata.…”

“…washing) prior to cooking or in salads (Rastogi & Shukla, 2013). Biorational insecticides provide of a safer, effective and sustainable insect pest management plan for organic production of amaranth as it leaves minimal negative footprints in the ecosystem (Korrat, Abdelmonem, Helalia, & Khalifa, 2012;Sufang et al, 2013;Iwuagwu et al 2019). Biorational insecticides obtained from leaves and flowers (e.g.…”