Improvement of Control Efficacy of Mancozeb Wettable Powder against Citrus Melanose by Mixing with Paraffin Oil

Abstract

This study was carried out to determine the effect of mixing with paraffin oil on rainfastness of mancozeb on citrus fruits and assay the improvement of control effect of mancozeb against citrus melanose by mixing with paraffin oil. In artificial rainfall condition (7.2 mm/hr), the attached contents of mancozeb on detached fruits were the most in treatment of mancozeb 0.2% + paraffin oil 0.1% as the contents was 7.43 μg/cm 2 after treatment of rainfall for 10 hr. In open field condition, the contents of attached mancozeb on fruits were significantly more in treatment of mancozeb 0.2% + paraffin oil 0.1% or 0.25% than the other treatments 1, 15 and 25 days after treatment 2009 and 2010 seasons. The disease incidence was significantly lower in treatment of mancozeb 0.2% + paraffin oil 0.1% or 0.25% than treatment of mancozeb 0.2% only 2009, 2010 and 2011 seasons. Based on this study, it was suggested that the control effect of mancozeb against citrus melanose can be improved by mixing with paraffin oil.

Response of Melon Powdery Mildew to a Biocontrol Agent Bacillus velezensis M10 and Paraffin Oil

“…Here, the Paraffin oil + culture broth treatment ceased or extensively slow down the spread of small lesion of white colonies compare to the initial occurrence on the leaves, which can be ascribed to role of paraffin oil in enhancement of adhesiveness of chemical substances. Yi et al (2014) reported that in control of the melanose disease of citrus, when paraffin oil added to the mancozeb wettable powder solution, chemical substance were attached on the surface of fruits more than treatments of wettable powder only. Furthermore, higher powdery mildew control in present study was demonstrated by combination of culture broth and paraffin oil as paraffin oil has been reported to enhance the antifungal activity of active ingredients with higher control efficiency as it slows down the dissolution of effective ingredient within the greenhouse environment even under the presence of strong sunlight and drying; and as a result, the adhesion on plant surfaces improved the extent of control effects (Yi et al 2014).…”

Development of Molecular Marker to Detect Citrus Melanose Caused by Diaporthe citri from Citrus Melanose-like Symptoms

“…Inoculums of D. citri were produced from dead twigs, and fungal spore production with pathogenic α type and non-pathogenic β type were affected by environmental conditions such as the temperature and rainfall conditions in the orchard. To prevent damage caused by melanose, mancozeb is sprayed in most citrus orchards from mid-June to late August or mid-September ( Yi et al, 2014 ).…”

Suppression of Melanose Caused by Diaporthe citri on Citrus Leaves Pretreated with Bio-sulfur

“…To control melanose on citrus, fungicide Mancozeb has been usually used in most orchards (Yi et al, 2014). However, because total numbers of beneficial insects are decreased when Mancozeb is sprayed to citrus orchards and quality of citrus fruits is reduced due to fruits peel damaged by the fungicide (Miles et al, 2004; Smith and Papacek, 1991), some systemic fungicides such as strobilurins have been alternatively applied (Bushong and Timmer, 2000).…”