ContacToxicity of Six Plant Extracts to Different Larval Stages of Colorado Potato Beetle (Leptinotarsa decemlineata SAY (Col: Chrysomelidae))

Abstract

Discovery of new eco-friendly methods for insect pest management is very important in integrated pest management program. Contact toxicity of six plant extracts i.e. Acanthus dioscoridis L. (Acanthaceae), Achillea millefolium L. (Asteraceae), Bifora radians Bieb. (Apiaceae), Heracleum platytaenium Boiss (Apiaceae), Humulus lupulus L. (Cannabaceae) and Phlomoides tuberosa (L.) Moench (Lamiaceae), were tested on the 1 st to 4 th instar larvae of Colorado potato beetle (Leptinotarsa decemlineata Say. (Coleoptera: Chrysomelidae)). The H. platytaenium and H. lupulus extracts were the most effective among the tested extracts, so dose-response bioassay was carried out only with H. lupulus and H. platytaenium against larval stages of Colorado potato beetle. The H. platytaenium extract was the most effective extract with calculated LD 50 values 0.126, 0.204, 0.206 and 0.458 μL insect-1 , LD 90 values were calculated as 0.345, 0.342, 0.402, 0.566 μL insect-1 for 1 st , 2 nd , 3 rd and 4 th instars larvae respectively. These results indicate that H. platytaenium and H. lupulus extracts have great potentials as insecticides in the management of larvae of L. decemlineata.

Alternatives to Synthetic Insecticides in the Control of the Colorado Potato Beetle (Leptinotarsa decemlineata Say) and Their Environmental Benefits

“…In another similar experiment, extracts of Acanthus dioscoridis L., Achillea millefolium L., Bifora radians, Heracleum platytaenium Boiss, H. lupulus, and Phlomoides tuberosa L. were tested against different larval stages for two days. For second to fourth instar larval stages, H. lupulus and H. platytenium reached the highest CPB mortality rate while the first larval stage was more susceptible [75].…”

“…Acanthus dioscoridis L. [74,75] protects potato leaves 1-2 days in field Achillea millefolium L. [74,75] protects potato leaves 1-2 days in field Aesculus hippocastanum L. [76] successful in field studies Alnus glutinosa L. [76] successful in field studies Arctium lappa L. [74] efficient, especially mid-high doses Armoracia rusticana L. [19] weak effects in field trials Artemisia absinthium L. [77] successful in field studies Artemisia vulgaris L. [5,77] efficient, also against CPB eggs…”

“…Bifora radians (M.Bieb) [74,75] efficient, especially mid-high doses Brassica napus L. [82] efficient in laboratory, strong vs. adults Buxus sempervirens L. [76] very successful in field studies…”

Determination of lambda-cyhalothrin and imidacloprid resistance and synergistic activity of diatomaceous earth in Leptinotarsa decemlineata Say, 1824 (Coleoptera: Chrysomelidae) populations

“…The larvae were then placed in 90-mm plastic Petri dishes with sufficient potato leaves in the incubator (Nüve EN500). After 24 h, the larvae that did not react when touched their body gently with a soft brush were considered to be dead (Alkan et al, 2017). Resistance ratio (RR) was classified according to Lee et al, (1999): RR < 2, no resistance or very low resistance; RR = 2-5, low level resistance; RR=5-10, moderate level resistance; and RR > 10, high level resistance.…”

Essential oil composition and insecticidal activity of Satureja boissieri against Sitophilus granarius (Coleoptera:Curculionidae) and Spodoptera littoralis (Lepidoptera: Noctuidae)

“…This may be interpreted as a decrease in activity of the essential oil as the larval period progresses depending on the physiology of the insect. Alkan et al (2017) found that the activity changed due to the larval period in the study conducted with Leptinotarsa decemlineata (Say) (Coleoptera: Chrysomelidae). Similarly, Karakoç and Gökçe (2012) were reported that as larval stages progressed activity was decreased.…”