Protective Effect of Iminoctadine tris(albesilate) and Kresoxim-methyl Fungicides to Citrus Postharvest Diseases caused by Penicillium spp.

The biological effects of the iminoctadine tris (albesilate) and kresoxim-methyl for the protection of citrus postharvest diseases caused by penicillium spp. were assayed. In vitro tests, values of iminoctadine tris(albesilate) were a.i./mL against mycelial growth of P. italicum and P. digitatum, respectively, but iminoctadine tris(albesilate) at a.i. /mL inhibited a little mycelial growth of unknown Penicillium sp. which produced another symptom different to blue and green mold caused by P. italicum and P. digitatum, respectively. And against germination and growth of germ tube of P. italicum and P. digitatum, value of iminoctadine tris(albesilate) was a.i./mL. But spore germination of unknown Penicillium spp. was not nearly inhibited at a.i./mL. values of kresoxim-methyl were , 0.04 and a.i./mL against mycelial growth of P. italicum, P. digitatum and unknown Penicillium sp., respectively, and a.i./mL and a.i./mL against germination and growth of germ tube of P. italicum and unknown Penicillium sp., and P. digitatum, respectively. Iminoctadine tris(albesilate) and kresoxim-methyl were markedly effective to control the postharvest disease by 7 days spray prior to harvest. When the fruits were sprayed with iminoctadine-tris(albesilate) ( a.i./mL) and kresoxim-methyl ( a.i./mL) 7 days prior to harvest and subsequently stored for 90 days, the percentage of diseased fruit by Penicillium spp. was in treatment of kresoxim-methyl and in iminoctadine-tris(albesilate), respectively. On the other hand, tile percentage of diseased fruit was relatively high, in thiophanate-methyl ( a.i./mL) and non-treatment, respectively. Maximum residue amount (ppm) among fruits (flesh and peel) assayed 0, 30, 60 and 90 days after storage was 0.45 and 0.10 ppm in treatment of kresoxim-methyl and iminoctadine, respectively.