Control of western flower thrips, Frankliniella occidentalis (Pergande) (Thysanoptera: Thripidae), by plant extracts on strawberry in greenhouse conditions

Abstract : The western flower thrips, Frankliniella occidentalis (Pergande) (Thysanoptera: Thripidae), is a most important pest of vegetable, fruit and ornamental crops around the world. The presence of this pest in strawberry fields has been associated with undesirable bronzing of the fruit. Experiments were conducted to assess the efficiency of four plant extract for control F. occidentalis on the strawberry in greenhouse conditions. Taguchi?s design of experiments method has been used for to plan a minimum number of experiments and optimization to control of F. occidentalis. Four factors, which influence the control thrips, were chosen. These factors are type of pesticide (neem extract, coconut soap, tobacco extract and garlic-onion-pepper extract), dosage (recommended and twice dose), droplet size (250 µm and 1000 µm) and application value of pesticide (60 cc and 90 cc per vase). Orthogonal array L8 was used with three replicates. In order to determine the optimum levels of the control factors precisely, analysis of variance was performed. After optimization, the results showed that application value was the most effective factor. The optimum condition for control of F. occidentalis was found to be garlic-onion-pepper extract in twice of recommended dosage (Grind 20 g of garlic, 30 g of onions and 7 g pepper) with droplet size 1000 µm, and 90 cc of pesticide per vase for application value. This study is warranted to determine suitability of garlic-onion-pepper extract, as botanical insecticide, for inclusion in F. occidentalis integrated pest management programs
Keyword : Frankliniella occidentalis, Strawberry, Plant extracts, Taguchi method, Greenhouse, Garlic-onion-pepper extract, Organic pesticides
Author(s) : , L. Kiani, M. Yazdanian, B. Tafaghodinia, M. H. Sarayloo
Downloads : 1192


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