Penekanan Hayati Penyakit Layu Fusarium Pada Subang Gladiol

Abstract

. Wardhana, D.W., L. Soesanto, and D.S. Utami. 2009. Biological Suppression of Fusarial Wilt onGladiolus Corms. The research was aimed to find out the best biological agent in suppressing Fusarium oxysporum f.sp.gladioli in planta on gladiolus corms. This research was carried out at the Screenhouse of Agricultural Faculty, JenderalSoedirman University, Purwokerto from August 2005 up to January 2006. Antibiotic of 2,4-diacetylphloroglucinol(Phl), Bacillus subtilis, Trichoderma harzianum isolated from ginger and ginseng were used with benomyl and warmwater as control. Randomized block design was used with 8 treatments and 4 replications. Results of the researchshowed that the best antagonist in suppressing the disease was T. harzianum ginger isolate with incubation period,disease intensity, and number of late population of 64.13 days after inoculation, 15.55%, and 20 cfu/g soil, respectively,or potentially decrease the disease up to 83.34%. The ginger isolate was the best isolate to improve crop height, leafnumber, corm and root fresh weight, leaves and stalk fresh weight, and leaves and stalk dry weight of 111.950 cm,6.625 sheet, 31.963 g, 39.338 g, and 6.075 g, respectively. The best flower stalk length (83.33 cm) and floret numberper stalk (6.13) were obtained from the use of antibiotic Phl treatment