caa a22 4500 469061049 CHVBK 20180323132857.0 cr unu---uuuuu 170328e19920701xx s 000 0 eng 10.1007/BF01193963 doi (NATIONALLICENCE)springer-10.1007/BF01193963 Euseius addoensis addoensis , an effective predator of citrus thrips, Scirtothrips aurantii , in the eastern Cape Province of South Africa [Elektronische Daten] [T. Grout, G. Richards] The predacious mite,Euseius addoensis addoensis (McMurtry) (Acari: Phytoseiidae), significantly (P<0.05) reduced scarring on ‘Palmer Navel' oranges,Citrus sinensis (L.) Osbeck, caused by the citrus thrips,Scirtothrips aurantii Faure (Thysanoptera: Thripidae). A chemical exclusion method employing dicofol was used to determine the effect of the predator and numbers ofS. aurantii were monitored on sticky yellow traps. At two sites where numbers of citrus thrips and predacious mites were high, the percentage fruit culled from export quality due to damage byS. aurantii was reduced from 25.5 to 15.5% and from 32.7 to 18.7% by predacious mite activity.Euseius a. addoensis sometimes prevented damage from exceeding 1% cull and was most effective when mean numbers exceeded one mite per inside leaf at petal fall. The best correlation between numbers of mites and the percentage fruit culled at harvest was −0.96 at the location with the highest number of citrus thrips. Tartar emetic (0.398% a.i.) plus sugar (0.4% a.i.) treatments for citrus thrips were slightly detrimental toE. a. addoensis populations but their numbers soon recovered. An alternative treatment, methiocarb 0.016% a.i. plus sugar (0.4% a.i.), almost eliminated the predacious mites and resulted in more citrus thrips damage (10.7% cull) than in the adjacent untreated control (0.2% cull) which contained predacious mites. Elsevier Science Publishers B.V., 1992 Grout T. Outspan Citrus Centre, P.O. Box 28, 1200, Nelspruit, South Africa aut Richards G. SA Co-op. Citrus Exchange Ltd., Centrahil, South Africa aut Experimental & Applied Acarology Kluwer Academic Publishers 15/1(1992-07-01), 1-13 0168-8162 15:1<1 1992 15 10493 https://doi.org/10.1007/BF01193963 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01193963 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Grout T. Outspan Citrus Centre, P.O. Box 28, 1200, Nelspruit, South Africa aut NATIONALLICENCE 700 1- Richards G. SA Co-op. Citrus Exchange Ltd., Centrahil, South Africa aut NATIONALLICENCE 773 0- Experimental & Applied Acarology Kluwer Academic Publishers 15/1(1992-07-01), 1-13 0168-8162 15:1<1 1992 15 10493 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer