Vietnam has approximately 155,000 hectares of durian plantations, with average yields of 25–30 tons per hectare. Durian growers face significant losses due to fungal infection (phytophthora) diseases, and there is an urgent need for recommendations to control these diseases. To evaluate the effectiveness of the bio-stimulants to control this diseases, a commercial product from OLMIX (Seamel Barricade) was applied on Ri 6 durian variety trees at flowering stage The results showed that the application of 1.5 ml/L of biostimulant performed better after 60 days of plant growth and improved positively the number of flower clusters (48.3 flowers/tree), the percentage of healthy flower clusters per branch (98.2%), the percentage of healthy flowers per cluster (93.4%), flower length (121.9 mm), and fruit set rate of 82%. In addition, we have observed that the fruit development occurred within 97 days after fruit set (DAS), and the highest fruit drop occurred in the 0-14 (DAS) (32.7%). Altogether, our results highlighted the crucial role of biostimulant application for controlling the fungal diseases for durian production in Vietnam.

Biostimulant, seaweed-based, diseases, durian

The experimental findings demonstrate that Seamel BARRICADE, particularly at 1.5 mL/L (treatment 3), significantly improves flower cluster formation, reduced disease incidence, and enhances flower development in Ri 6 variety of durian. These outcomes highlight the importance of applying foliar bio-stimulants at critical phenological stages of durian production and support the integration of Seamel BARRICADE into durian flower management programs in the Mekong Delta region.

Truong Thanh Xuan Lien, Nguyen Chi Long and Nguyen Viet Thanh (2025). Application of seaweed-based biostimulant reduced the fungal damage during flower induction in Durian Ri6 variety trees. Biological Forum, 17(9): 14-18.