784 KB0 KB200420252024Allal Benfekih, LeilaGoosen, Mattheus F. A.Mahmoudi, Abdelhaqštevilka:111 str.letnik:120DOI:10.14720/aas.2024.120.1.18050ISSN:1854-1941COBISSID_HOST:191811331URN:URN:NBN:SI:doc-7TQC5H7GenZaložba Univerze v LjubljaniActa agriculturae SlovenicaabundanceAlgeriaAlžirijacitrusiclimatic parametersDialeurodes citriplenilcipodnebni parametripredatorsškodljivci rastlinštevičnostInvestigation of fluctuation in infestation of citrus whitefly Dialeurodes citri (Ashmead, 1885) and its predators in organic citrus orchards under varying climatic conditions| a case study from north-west Algeria|The citrus pest, Dialeurodes citri (Ashmead, 1885), poses a significant threat to citrus crops, impacting growth. Various control methods, including biological measures using natural predators like Clitostethus arcuatus (Rossi, 1794), Chrysoperla carnea (Stephens, 1836), and Semidalis aleyrodiformis (Stephens, 1836), were studied over a year in the Chlef region of northwest Algeria. Results indicated that a temperature range of 19.5 °C to 30.5 °C, with 65 % humid-ity and no precipitation, favored the emergence of D. citriadults. Throughout the study, S. aleyrodiformis and C. arcuatusemerged as the predominant predators. A strong negative cor-relation (r = -0.91) was observed between D. citri abundance and C. arcuatus caught on traps. The correlation between nymphal infestation rates and monthly average temperatures was negative (r = -0.72), with temperatures ranging from 13 °C to 27 °C and humidity between 47 % and 73 %, conducive to D. citri nymphal infestation. Precipitation negatively impacted D. citri and its predators, causing a decline in adult numbers during the rainy season. The overarching goal is to establish an integrated biological control system, bolstering the economic viability of citrus cultivation in the regionŠkodljivec agrumov Dialeurodes citri (Ashmead, 1885) predstavlja pomembno grožnjo pridelavi agrumov zaradi negativnega vpliva na rast. Različne metode njegovega zatiranja, vključno z biotičnimi, ki vključujejo plenilce, kot so vrste Clitosthutus arcuatus (Rossi, 1794), Chrysoperla carnea (Stephens, 1836) in Semidalis aleyrodiformis (Stephens, 1836), so bile preučevane v eni rastni dobi na območju Chlef v severozahodni Alžiriji. Rezultati so pokazali, da je temperatura v območju od 19,5 do 30,5 °C, ob 65 % relativni zračni vlagi in brez padavin, pospeševala pojav odraslih osebkov škodljivca. Skozi celotno obdobje raziskave sta se vrsti S. aleyrodiformis in C. arcuatus pojavljali kot glavna plenilca. Ugotovljena je bila moč-na negativna korelacija (r = -0,91) med številčnostjo škodljivca (D. citri) in plenilca C. arcuatus na pasteh. Korelacija med številčnostjo nimf in poprečno mesečno temperaturo je bila negativna (r = -0,72), s temperaturo od 13 do 27 °C in relativno zračno vlago med 47 in 73 %, kar je pospeševalo napad nimf škodljivca. Padavine so negativno vplivale na škodljivca in njegove plenilce, kar je povzročilo upad števila odraslih osebkov v deževnem obdobju. Glavni namen raziskave je vzpostaviti sistem integriranega varstva, kar bi pospešilo bolj gospodarno gojenje agrumov na območju raziskaveTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaUniverza v Ljubljani, Biotehniška fakulteta