Successful Control of Postharvest Disease Using an Integration of Induced Systemic Resistance and Bio-control Organisms
J.P. Bower
Program and Abstract. Australasian Postharvest Horticulture Conference. Royal Lakeside Novote., Rotorua, New Zealand. 27-30 September 2005. July 5-10, 2005. Page 27
2005
บทคัดย่อ
Successful Control of Postharvest Disease Using an Integration of Induced Systemic Resistance and Bio-control Organisms
Although the use of bio-control organisms for postharvest disease control has been studied for some time, commercial success without simultaneous use of chemical fungicides has been limited. This tie mainly been due to an inability of the control organisms to out-compete the pathogens. In this study a different approach has been taken. A systemic resistance inducing compound (ISR2000TM) was applied before harvest, to boost anti-fungal compounds in the fruit (citrus) rind. Postharvest, registered bio-control products (a yeast in the case of Navel oranges, and a bacteria for ‘Valencias’) was applied. Fruits were inoculated with Penicillium digitatum and pathogen growth evaluated after 10 days at 20°C and also after 30 days storage for Valencias' Results were evaluated against Imazalil. It was found that anti-fungal compounds in the rind were enhanced by application of ISR2000TM. As a treatment on their own, both ISR2000TM and the bio-control agents suppressed pathogen development, but were not commercially acceptable. In combination, however, results statistically similar to Imazalil were obtained. The ISR2000TM required three weeks to induce the maximum systemic resistance, and concentration required was higher in Valencias' than navels'. it is- concluded that the principle of enhancing endogenous anti-fungal compounds using a systemic resistance inducer such as ISR2000TM makes it possible for commercially acceptable bio-control using competitive inhibition organisms. Work on avocado and mango for latent infections is showing promise.