SummaryFumigation with phosphine gas is the primary method of controlling stored grain pests. In Turkey, phosphine has been used extensively since the 1950's. Even though high levels of phosphine resistance have been detected in several key stored products pests across the world, it has never been studied in Turkey despite this long history of phosphine use. High-level phosphine resistance has been detected and genetically characterised previously in the rust red flour beetle, Tribolium castaneum in other countries. Since this pest is also a common problem in stored grain environment in Turkey, the current study was undertaken for the first time, to investigate the distribution and strength of phosphine resistance in T.castaneum. Four strains of T. castaneum were tested through bioassays for determining the weak and strong phosphine resistance phenotypes on the basis of the response of adults to discriminating phosphine concentrations of 0.03 mg/L and 0.25 mg/L, for 20 hour exposures respectively. Phenotype testing showed all strains exhibited some level of phosphine resistance with a maximum level of 196 fold. Sequencing and genetic testing of seven field-collected strains showed that all of them carried a strong resistance allele in at the rph2 locus similar to the one previously reported. Our results show that strong resistance to phosphine is common in Turkish strains of T. castaneum.
Keywords:Wheat, phosphine resistance, Tribolium castaneum, molecular diagnostic, dihydrolipoamide dehydrogenase, dld
ÖzetDepolanmış hububattaki zararlılarla mücadeledeki ana yöntem fosfin gazı ile fumigasyondur. Fosfin gazı Türkiye'de 1950'li yıllardan beri yoğun olarak kullanılmaktadır. Fosfinin uzun yıllardan beri depolanmış hububatta kullanımına ve dünyada da pek çok ülkede yüksek seviyelerde fosfin direncinin belirlenmiş olmasına rağmen Türkiye'de bugüne kadar bu konuda herhangi bir çalışma yapılmamıştır. Yüksek seviyelerde fosfin direnci, un biti Tribolium castaneum'da belirlenerek direnç yapısı genetik olarak tanımlanmıştır. Bu zararlı Türkiye'de depolanmış buğdayda yaygın bir zararlı konumunda olduğundan, bu ilk çalışma fosfin direncinin T. castaneum'daki durumunu ve ülkedeki dağılımını ortaya koymak üzere yürütülmüştür. Dört popülasyon, zayıf ve kuvvetli direnç için sırasıyla ayırıcı fosfin konsantrasyonları olan 0.03mg/L ve 0.25mg/L dozları ile 20 saat süreyle uygulama temeline dayanan bioassaylerle test edilmişlerdir. Bu testlerde popülasyonların tümünde direnç olduğu ve direnç oranının 196 kata kadar ulaştığı belirlenmiştir. Yapılan genetik çalışmalar ve sekans, tüm popülasyonların kuvvetli direnç allellerine sahip olduklarını ve bu popülasyonların daha önce literatürde rapor edilenlere benzer olarak rph2 lokusundaki direnç allelini taşıdıklarını göstermiştir. Çalışma sonuçlarımız, T. castaneum'un Türkiye popülasyonlarında fosfine karşı güçlü bir direncin yaygın olduğunu göstermektedir.
Abstract. Wolbachia is a maternally transmitted intracellular symbiont which causes reproductive distortions in the arthropods it infects. In recent years there has been an increasing interest in using Wolbachia as a potential tool for biological control by genetic manipulation of insect pests. In the present paper we report Wolbachia infection in several Trissolcus wasps (Hymenoptera: Scelionidae) which are important egg parasitoids of the sunn pest, Eurygaster integriceps Puton (Heteroptera: Scutellaridae). We used DNA sequence data for a gene encoding a surface protein of Wolbachia (wsp) not only to confirm Wolbachia infection but also to discriminate Wolbachia strains. Phylogenetic analyses indicated that Wolbachia strains in Trissolcus species were closely related to one another and belonged to supergroup B. Determination of the infection status of various populations, the possible role of Wolbachia in causing the incompatibility and knowledge of the reproductive compatibility of Trissolcus populations is important for the success of parasitoids in sunn pest management.
The Scelionidae were studied in some regions of Eastern Iran. In total 23 species from 7 genera were collected, among which two species, Eumicrosoma phaeax (Nixon, 1938) and Sparasion punctatissimum Kieffer, 1906, are new records for Iran.
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