Lethal effects of four insecticides on immature stages of Chrysoperla carnea (Stephens) (Neuroptera: Chrysopidae) in laboratory conditions

Abstract

Chrysoperla carnea (Stephens) is a general biocontrol agent of several insect pests in greenhouses. The lethal effects of four compounds, imidacloprid, lufenuron, thiametoxam and thiodicarb, on the eggs and 1st instar larvae of C. carnea were studied in laboratory conditions. Dipping bioassay tests were used for eggs and the residual contact method for larvae. Positive relationships were detected between the concentrations of insecticides and mortality rates of various stages. However, there were considerable variations in toxicity of insecticides. Thiodicarb had no effect on eggs, whereas thiametoxam with an LC50 value of 1.90 μg ai. L-1 showed the highest ovicidal activity. On larvae, thiametoxam was the most toxic (LC50= 0.55 μg ai. L-1) and lufenuron proved to be the least toxic (LC50 = 44.02 μg ai. L-1). The use of thiametoxam should be carefully evaluated if employed in combination with C. carnea in IPM programs

Keywords

• Chrysoperla carnea, imidacloprid, lufenuron, thiametoxam, thiodicarb

Laboratuvar şartlarında Chrysoperla carnea (Neuroptera: Chrysopidae) (Stephens)'nın ergin öncesi dönemleri uzerine dört insektisitin öldürücü etkileri

Öz

Chrysoperla carnea (Stephens) seralarda birkaç zararlıyı kontrol altinda tutan genel bir biyolojik savaş ajanıdır. Imidacloprid, lufenuron, thiametoxam ve thiodicarb olmak uzere dört bilesigin oldurucu etkileri C. carnea’nın yumurta ve birinci dönem larvaları üzerinde, laboratuvar koşullarında denenmiştir. Bioassay testlerde yumurta için daldırma yöntemi, larvalar için rezidüel kontakt metodu kullanılmıştır. İnsektisitlerin konsantrasyonları ile degisik donemlerin ölüm oranları arasinda pozitif bir ilişki belirlenmiştir. Ancak, insektisitlerin toksisitesinde önemli farklılıklar görülmüştür. Thiodicarb yumurta üzerinde etkili olmamis, thiametoxam ise 1.90 μg ai. L-1 LC50 değeriyle en yüksek ovisidal etkiyi göstermiştir. Larvalar üzerinde, thiametoxam en zehirli (LC50 = 0.55 ug ai. L-1) ve lufenuronun en az zehirli olduğu kanıtlanmıştır (LC50 = 44.02 mg ai. L-1). Thiametoxamin IPM programlarında C. carnea ile kombinasyon halinde kullanılma durumu dikkatli bir şekilde değerlendirilmelidir

Anahtar Kelimeler

• Chrysoperla carnea, imidacloprid, lufenuron, thiametoxam, thiodicarb

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