Isithombe: Iqabunga Lommbila Elinezilonda Zokubuthana Kwamagciwane ZikaStewart
Kushicilelwe: Mashi 16, 2026 22:44:03 UTC
Isithombe esiseduze seqabunga lommbila elithintekile ukubuna kwamagciwane kukaStewart, esibonisa izilonda ezinde eziphuzi-nsundu ezinama-exudates amnyama amagciwane kanye nama-chlorotic halos.
Corn Leaf with Stewart’s Bacterial Wilt Lesions
Izinguqulo ezitholakalayo zalesi sithombe
Amafayela ezithombe atholakalayo ukuze alandwe ngezansi awacindezelwe kakhulu futhi anesisombululo esiphezulu - futhi ngenxa yalokho, ikhwalithi ephezulu - kunezithombe ezifakwe ezihlokweni nasemakhasini akule webhusayithi, ezilungiselelwe kangcono usayizi wefayela ukuze kuncishiswe ukusetshenziswa komkhawulokudonsa.
Usayizi ojwayelekile (1,536 x 1,024)
Usayizi omkhulu (3,072 x 2,048)
Usayizi omkhulu kakhulu (4,608 x 3,072)
Usayizi omkhulu kakhulu (6,144 x 4,096)
Usayizi omkhulu ngokwe-comic (1,048,576 x 699,051)
- Isalayisha... ;-)
Incazelo yesithombe
Lesi sithombe esiseduze esinesinqumo esiphezulu sibonisa iqabunga elilodwa lommbila (ummbila) elibonisa izimpawu ezicacile nezithuthukile zokubuna kwamagciwane kukaStewart, isifo esibangelwa yibhaktheriya iPantoea stewartii. Iqabunga liqondiswe ngokuvundlile ngaphesheya kohlaka kusukela kwesobunxele esingezansi kuya kwesokudla esiphezulu, lithatha ingxenye enkulu yesithombe. Umbala walo oluhlaza okwesibhakabhaka wemvelo uphazanyiswa uchungechunge lwezilonda ezinde, ezingajwayelekile ezihambisana nemithambo yamaqabunga. Lezi zilonda zibonakala ziphuzi kuya konsundu emaphethelweni futhi zinsundu omnyama maphakathi, zakha amaphethini afana nemigqa ajwayelekile ekuqhubekeni kwesifo ezicutshini zemithambo yegazi. Ezizungeze izilonda eziningi kukhona ama-halo ahlukile e-chlorotic—izindawo eziphuzi ezikhanyayo lapho izicubu zezitshalo seziqale ukulahlekelwa yi-chlorophyll ngenxa yokutheleleka.
Ngaphakathi kwezingxenye ezimnyama eziphakathi zezilonda eziningana, kubonakala amaconsi amancane amnyama, acwebezelayo kanye nokuqongelela okunamachashaza. Lokhu kumelela ama-bacterial exudates kanye nezinto zezitshalo eziwohlokile eziqoqana njengoba i-pathogen isanda futhi isakazeka ngezicubu zeqabunga. Izilonda ziyahlukahluka ngobukhulu kanye nesimo; ezinye zihlala zincane futhi zinde, kanti ezinye zihlangene zaba imicu ebanzi ye-necrotic. Kwezinye izindawo ukutheleleka kubonakala kuthuthukile kakhulu, lapho izicubu seziphenduke zaba nsundu ngokujulile futhi ubuso beqabunga bubukeka bucwile kancane noma buwohlokile.
Uhlangothi oluphakathi lweqabunga luhlala lubonakala njengomugqa ophaphathekile, ophakanyisiwe odlula phakathi, ohlinzeka ngomehluko nezicubu ezinesifo ezizungezile. Imithambo efanayo efana namaqabunga ommbila idala ukuthungwa okuqondile okugcizelela indlela ukutheleleka okulandela ngayo izindlela zemithambo yegazi. Naphezu komonakalo, ezinye izingxenye zeqabunga zisagcina umbala oluhlaza onempilo, okugqamisa umehluko omkhulu phakathi kwezicubu eziphilayo nezindawo ezithintekile yisifo samagciwane.
Ingemuva lifiphele kancane, liqukethe amaqabunga ommbila aluhlaza kanye neziqu ezingacacile. Lokhu kujula kwensimu okungajulile kuhlukanisa iqabunga elithelelekile njengesihloko esiyinhloko futhi kunikeza umongo wokuthi isitshalo sitholakala ensimini yommbila. Ukukhanya kungokwemvelo futhi kuyalingana, okubonisa indawo yezolimo yangaphandle. Ukugqama okucashile ebusweni beqabunga kwembula ukuthungwa kwalo okufana ne-wax kanye nemiphetho ephakanyisiwe kancane ezungeze ezinye izilonda.
Sekukonke, isithombe sinikeza isibonelo esicacile esibonakalayo sezimpawu zokubuna kwamagciwane kukaStewart emaqabunga ommbila. Inhlanganisela yezilonda ezinde eziphuzi ezinomphetho, imicu emnyama efile, kanye nama-exudates amagciwane abonakalayo abonisa ukubukeka okuhlukile kwalesi sifo njengoba sisakazeka emithanjeni yamaqabunga. Isithombe sifaneleka kahle ngezinjongo zemfundo, zokuxilonga, noma zezolimo, kusiza ababukeli ukuthi babone amaphethini ahlukile ahlobene nalokhu kutheleleka kwamagciwane ezitshalweni zommbila.
Isithombe sihlobene: Ukukhulisa Ummbila: Umhlahlandlela Wakho Ophelele Wempumelelo Emnandi Engadini