Tunisia - Iresa

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Table 1. Thrips species collected in 7 citrus orchards of Tunisia (Bizerte and Cap-Bon) from 25 March to 29 April 2010 Family Species Locality Region Citrus variety Mraissa chatt Goba Mraissa Cap-Bon Valencia late Maltaise Double fine Thripidae Thrips sp. Azib 1 Meski Azib 2 Alia Bizerte Thomson Maltaise Sounine Lemon Mraissa chatt Cap-Bon Valencia late Azib 1 Meski Thripidae Odontothrips karnyi Azib 2 Sounine Bizerte MA3 Kassar Thomson Thripidae Limothrips cerealium Mraissa chatt Valencia late Cap-Bon Mraissa Kassar Azib1 Bizerte Meski Thripidae Frankliniella occidentalis Mraissa chatt Goba Cap-Bon Valencia late Thomson Maltaise Thripidae Aeolothripidae Aptinothrips elegans Melanthrips fuscus Alia Bizerte MA3 Mraissa chatt Cap-Bon Valencia late Azib 1 Bizerte Meski Mraissa chatt Cap-Bon Valencia late Azib 2 Bizerte MA3 Aeolothripidae Aeolothrips citricinctus Mraissa chatt Goba Cap-Bon Valencia late Maltaise Thripidae Thrips major Mraissa chatt Cap-Bon Valencia late Thripidae Thrips tabaci Mraissa chatt Cap-Bon Valencia late Thripidae Stenothrips graminum Mraissa chatt Cap-Bon Valencia late Phlaeothripidae Haplothrips sp. Mraissa chatt Cap-Bon Valencia late Thripidae Thrips angusticeps Mraissa chatt Cap-Bon Valencia late Thripidae Pezothrips kellyanus Azib Bizerte Thomson Tunisian Journal of Plant Protection 46 Vol. 7, No. 1, 2012
Thrips damages in citrus orchards. The thrips damage is characterized by silvery discolorations on mature fruits. We noticed that these discolorations can have several appearances: rings at the base of the peduncles of fruits with or without marblings or marbling surfaces more or less spread on the mature fruits (Figure 1). If the first symptoms can be attributed undoubtedly to thrips and very probably to P. kellyanus infestation because they are specific to this species, for the second it is much harder to determine the causal pest. Indeed, such symptoms can be caused by biotic (thrips or other insects) or abiotic factors (wind, branch rubbing, etc). All these symptoms have been encountered varying from 47 to 72% and 39 to 86% of fruits respectively in Bizerte and Cap-Bon orchards but we are not able at this stage to precise the proportion of scarred fruits caused by thrips. Interestingly, we remarked that the percentage of damaged fruits increases with the frequency of chemical treatments (Table 2). a b c d Fig. 1. Different appearances of scarred fruits observed in the regions of Cap-Bon and Bizerte (Tunisia). a and b: ring on the base of the peduncle and on the base of fruit very probably caused by thrips on mature oranges of the varieties Valencia late and Thomson, respectively. c and d: Marblings on mature oranges of the varieties Thomson and Grapefruit, respectively. Tunisian Journal of Plant Protection 47 Vol. 7, No. 1, 2012
Page 1 and 2: Inventory of Thrips Species in Citr
Page 3: orchards. Thus, 7 orchards from the
Page 7 and 8: Bizerte, are Thrips sp., O. karnyi,
Page 9 and 10: abundance, fruit damage and monitor

Tunisia - Iresa

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