Impact of intraguild predation and lambda‐cyhalothrin on predation efficacy of three acarophagous predators

Abstract

This laboratory study reports the interaction of three predators found in commercial apple orchards in Quebec, Hyaliodes vitripennis (Say) (Hemiptera: Miridae), Harmonia axyridis Pallas (Coleoptera: Coccinellidae) and Amblyseius fallacis (Garman) (Acarina: Phytoseiidae). First, intraguild predation between H vitripennis and the two other predators was characterized in the absence and presence of their extraguild prey, Tetranychus urticae Koch. The results showed an asymmetrical interaction in favour of the larger predator and the levels of intraguild predation were weak for the two predatory combinations. Presence of the phytophagous mite reduced the intensity of intraguild predation in the predatory combination of H axyridis and H vitripennis. Second, the effects of intraguild predation and the application of lambda-cyhalothrin on predation efficacy of the predators were evaluated. The application of the insecticide reduced prey consumption of H vitripennis and H axyridis but did not affect that of A fallacis. Combination of predators and an insecticide application resulted in two different situations depending on the species involved: a reduced predation efficacy for the combination of H vitripennis and H axyridis due to a knockdown effect caused by the insecticide, and no effect on T urticae consumption for H vitripennis and A fallacis. It is suggested that an integrated pest management program based on H vitripennis, A fallacis and lambda-cyhalothrin may be evaluated to repress phytophagous mites in Quebec orchards.

Dietary effects upon biological performance and lambda-cyhalothrin susceptibility in the multicolored Asian lady beetle, Harmonia axyridis

“…Diverse effects could be produced in larvae and adults of H. axyridis after lambda-cyhalothrin exposure. Reduced predation efficacy and mobility of larva, and high acute toxicity could be mentioned as examples of these effects (Provost et al 2003(Provost et al , 2005Rodrigues 2012;Ruberson et al 2007;Torres & Ruberson 2005). The high susceptibility of H. axyridis to lambda-cyhalothrin found here is comparable to other pyrethroid insecticides, such as fenpropathrin, esfenvalerate, bifenthrin at field rates under laboratory conditions (Cho et al 1997;Galvan et al 2005Galvan et al , 2006Michaud 2002;Michaud & Grant 2003).…”

Voracity of Coccinella undecimpunctata: effects of insecticides when foraging in a prey/plant system

“…Garcia (1979) observed that 4th instar larvae of C. sulphurea and Semidalia undecimnotata (Coleoptera: Coccinellidae) reduced the number of prey consumed after direct exposure to an identical dose of pirimicarb. Topical exposure to other pesticides such as benomyl and azadirachtin on C. maculate lengi (Roger et al 1994(Roger et al , 1995 and lambda-cyhalothrin on Harmonia axyridis (Provost et al 2005) significantly decreased the rate of aphid consumption.…”

Intraguild Interactions

“…The presence of less mobile extraguild prey (phytophagous mites), to which the attacks of mirids were directed, further reduced IGP intensity (Provost et al 2005(Provost et al , 2006. Asymmetrical IGP in favour of the coccinellid was observed between Har.…”