On the current state of knowledge concerning certain arthropods injurious to citrus in Sicily.
The most important species of arthropod pests of citrus in Sicily (some 30 species in all, mostly insects but including 7 species of mites) are reviewed, notes on recent attacks on citrus, biological information recently obtained, natural enemies and chemical control being included. Although populations of most of these pests may be reduced below the economic threshold by rational chemical treatments, the side-effects on beneficial arthropods make it advisable to use biological methods of control where possible; this is particularly true of Planococcus citri (Risso) and Prays citri (Mill.), for which the use of the introduced predator Cryptolaemus montrouzieri Muls. and of the pathogen Bacillus thuringiensis, respectively (in conjunction with the many species of parasites of these pests occurring naturally), is both more effective and safer than the application of chemical insecticides. An index to all genera and species of arthropods mentioned, including the natural enemies of the pests, is appended.