บทคัดย่องานวิจัย

หมวดหมู่ : ฐานข้อมูลงานวิจัย

Evaluation of polyhexamethylene biguanide for control of postharvest diseases of Florida citrus

Brown, G. E. and Chambers, M.

Proceedings of the Florida State Horticultural Society Year: 1999, publ. 2000 Issue: No. 112 Pages: 118-121.

1999

บทคัดย่อ

Evaluation of polyhexamethylene biguanide for control of postharvest diseases of Florida citrus.

Aqueous applications of polyhexamethylene biguanide (PHMB) (1000 to 4000 ppm) to citrus fruits (Sunburst tangerine [mandarins], Orlando tangelo, and Ambersweet and Hamlin orange) provided significant control of stem-end rot (SER) caused by Diplodia natalensis [Botryodiplodia theobromae], sour rot caused by Geotrichum citri-aurantii, and green mould caused by Penicillium digitatum. The control of SER in Ambersweet and Hamlin oranges and mandarins was not as effective as the control obtained with thiabendazole (TBZ) (700 and 1000 ppm TBZ before and after degreening, respectively). Sour rot control in tangelos by PHMB at 2000, 3000 or 4000 ppm was significantly better than the control obtained with sodium orthophenylphenate (SOPP) [sodium orthophenylphenoxide] at 20 000 ppm (54.5% rot). Efficacy against green mould in Hamlin oranges was similar to the efficacy of 1000 ppm TBZ and 1000 ppm imazalil (2.5 and 2.3% mould, respectively). Though efficacy against SER was nominal, applications of PHMB (100

0-4000 pmm) before mandarin degreening combined with 1000 ppm TBZ application after degreening were as effective as TBZ application before and after degreening. PHMB at 250 or 500 ppm effectively reduced the propagule viability of G. citri-aurantii from simulated bin drencher suspensions as effectively as chlorine at 50 ppm. PHMB may function as the sole ingredient in bin drenchers and eliminate the need for chlorine, as long as the fruit receive an application of TBZ on the packing line to achieve optimum control of SER.