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16. Li B., Xu X. 2002. Infection and development of apple scab ( Venturia inaequalis)on old leaves. Journal of Phytopathology, 150(11–12): 687–691.17. Raudonis L. 2002. Integrated control strategy of apple scab according to warningequipment. Plant Protection Science, 38(2): 700–703.18. Raudonis L., Valiuškaitė A., Rašinskienė A., Survilienė E. 2003. Pest and diseasemanagement model of apple-trees according to warning equipment. Sodininkystėir daržininkystė, 22(3): 528–537.19. Raudonis L., Valiuškaitė A., Survilienė E. 2008. Effect of abiotic factors forrisk of venturia inaequalis infection depending on apple-tree growth stages.Sodininkystė ir daržininkystė, 27(2): 411–418.20. Raudonis L., Valiuškaitė A. 2003. Research on pest and disease control in horticulturalplants and its development in Lithuania. Sodininkystė ir daržininkystė,22(3): 3–14.21. Rubatsky V. E. 2002. Origin and domestication of carrot. In: R. M. Davis, R. N. Raid(eds.), Compedium of Umberlliferous Crop Diseases. American PhytopathologicalSociety, St. Paul, MN, 1–3.22. Soteros, J. J. 1979. Pathogenicity and control of A. radicina and A. dauci in carrots.New Zealand Journal of Agricultural Research, 22: 191–196.23. Žemės ūkio augalų kenkėjai, ligos ir jų apskaita. 2002. J. Šurkus, I. Gaurilčikienė(sudaryt.). Lietuvos žemdirbystės institutas, Akademija, Kėdainių r.SODININKYSTĖ IR DARŽININKYSTĖ. SCIENTIFIC ARTICLES. 2008. 27(3).Investigations of efficiency of disease and pest warning models ofhorticultural plants using iMETOS internet based warning systemL. Raudonis, A. Valiuškaitė, E. SurvilienėSummaryAn efficiency of disease and pest warning models of horticultural plants using iMETOSInternet warning system was investigated under Lithuanian conditions at the Lithuanian instituteof Norticulture in 2006–2007. An efficiency of warning system against apple scab on leaves was82.7–89.4 % (incidence), 86.7–93.6 % (intensity), accordingly. Efficiency against scab on fruitswas 93.5–98.7 % (incidence), 96.9–99.1 % (intensity). Apple trees were sprayed on average 9times per season according to growth stages, meanwhile only 8 times when scab was controlledusing warning system. An efficiency of warning system against Cydia pomonella was 88.6 %.The cherries were effectively protected against Monilinia laxa on fruits, using warning systemiMETOS. Efficiency of iMETOS warning system against Peronospora destructor in onionswas 94.2 %. The model of warning system iMETOS was effective against Alternaria radicinaby 91.7 %. Efficiency of iMETOS warning system against Psilae rosae in carrots was 93.6 %.Some pest and disease warning models were investigated for the first time, therefore for finalvalidation of the models under Lithuanian conditions the experiments should be continued.Key words: diseases, efficiency, iMETOS®sm warning system, pests.287