Efficiency of fermented lychee leaf biochar extract for enhancing growth, yield and protection against Mealybug (Phenacoccus longispinus) in yardlong bean
Keywords:
Biochar, Lychee leaf, Mealybug, Yardlong bean, Organic agricultureAbstract
This study aimed to evaluate the efficacy of fermented lychee leaf biochar extract on growth, yield, and protection against mealybug (Phenacoccus spp.) in yardlong bean. The experiment was conducted in a greenhouse using a completely randomized design (CRD) to compare the efficacy of four treatments of fermented bio-extract from: lychee biochar, neem, pineapple and tobacco, with four replications each. The bioliquids were sprayed onto yardlong bean plants every three days from 80 to 101 days after planting, for a total of 7 applications. Mealybugs were artificially released onto the inflorescence area at 94 days after transplanting. The results indicated that plant growth among the treatments showed no statistically significant differences; however, the fermented lychee leaf biochar extract tended to promote higher growth compared to other bioliquids. Regarding pest control efficacy, the fermented lychee leaf biochar extract exhibited the highest mean pH value (7.62) and achieved the fastest reduction in mealybug populations (within 7 days). Moreover, it consistently maintained the lowest infestation severity level (scale 1) throughout the experiment and produced the highest pod yield (70.75 g per plant). In conclusion, the fermented lychee leaf biochar extract demonstrated strong potential as a biobased agent for promoting growth and yield of yardlong bean, while effectively controlling mealybug infestation. This product could serve as an alternative to chemical pesticides or other biocontrol agents.
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