Effect of different phosphine gas concentrations against Frankliniella occidentalis (Pergande, 1895) (Thysanoptera: Thripidae) on tomato and green pepper fruit, and determination of fruit quality after application under low-temperature storage conditions

Abstract

            In this study, we investigated the control of western flower thrips [Frankliniella occidentalis(Pergande, 1895) (Thysanoptera: Thripidae)], which is an important pest in tomato and green pepper growing areas in Turkey, under cold storage conditions with phosphine fumigation. The trials were conducted in Mersin in 2015, due to infestations of F. occidentalisdamaging the export quality of tomatoes and green peppers. The experiments were conducted by using ECO2FUME®with different phosphine gas concentrations including 500, 1000 and 2000 ppm. Fumigation chambers were kept at 4ºC. Lowest mortality was seen at 500 ppm gas concentration with 72% for larval stage on tomatoes and 73.75% mortality for pupal stage on green pepper. The data demonstrate that the minimum requirementof phosphine gas concentration 100% mortality of all stages of F. occidentaliswas at 2000 ppm. The quality of treated fruit was investigated by analyzing weight loss, sensory quality, fruit firmness, fruit skin color, total soluble solids, titratable acidity contents, physiological and pathological disorders. After treatment, there were no changes in physiologic, pathological and shelf-life properties of the products. The results indicated that, phosphine is a suitable fumigant at low temperature for disinfestion of F. occidentalisfrom tomatoes and green peppers before shipment.

Keywords

• Fumigation
• phosphine
• quality analyze
• quarantine
• storage

Farklı fosfin gaz konsantrasyonlarının düşük sıcaklık depolama koşullarında domates ve yeşil biberde karantina zararlısı Frankliniella occidentalis (Pergande, 1895) (Thysanoptera: Thripidae)’e karşı etkileri ile uygulama sonrası meyve kalitesi üzerine etkisinin belirlenmesi

Öz

Bu çalışma ile Türkiye’de domates ve yeşil biber alanlarında önemli bir zararlı olan batı çiçek tripsi [Frankliniella occidentalis(Pergande, 1895) (Thysanoptera: Thripidae)]’nin soğuk hava depolama koşullarında fosfin fümigasyonu ile kontrolü araştırılmıştır. Domates ve yeşil biberin ihracat kalitesine zarar yapan F. occidentalis bulaşmasına bağlı olarak, denemeler 2015 yılında Mersin'de gerçekleştirilmiştir. Denemeler ECO2FUME®preparatı ile 500, 1000 ve 2000 ppm’lik farklı fosfin gaz konsantrasyonunda test edilmiştir. Fümigasyon birimleri 4ºC tutulmuştur. En düşük ölüm oranı 500 ppm gaz konsantrasyonunda %72 ile domateste larva döneminde, yeşil biberde ise %73.75 ölüm oranı ile pupa döneminde görülmüştür. Çalışmadan elde edilen verilere göre batı çiçek tripsi’nin bütün dönemlerinin ölümü için en az 2000 ppm’lik gaz konsantrasyonunun gerekli olduğu ortaya konmuştur. Uygulama yapılan meyvenin kalitesi, ağırlık kaybı, duyusal kalite, meyve sıkılığı, meyve rengi, toplam çözünebilir katı madde, titrasyon asitliği içeriği, fizyolojik ve patolojik bozukluklar analiz edilerek incelenmiştir. Fosfin uygulamasından sonra ürünlerde fizyolojik, patolojik ve raf ömrü üzerinde herhangi bir değişim olmamıştır. Sonuçlar, taşıma öncesinde düşük sıcaklıkta F. occidentalis'in domates ve yeşil biberden dezenfekte edilmesi için fosfinin uygulanabileceğini ortaya koymuştur.

Anahtar Kelimeler

• Fümigasyon
• fosfin
• kalite analizi
• karantina
• depolama

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