Investigates the Incidence and Population Densities of Plant Parasitic Nematodes in Citrus Orchards Across Three Localities

Abstract

This study investigates the incidence and population densities of plant parasitic nematodes in citrus orchards across three localities: Palai Katlang, Rabbot Dir L, and Dargai Jabbon. The highest disease incidence (70%) was observed in Palai Katlang, followed by Rabbot Dir L (50%) and Dargai Jabbon (40%). Palai Katlang also exhibited the highest nematode population density, particularly in samples S8 (90%) and S9 (85%). Soil analyses revealed that all three locations had similar silt-loam textures, with Palai Katlang having the highest pH (8.94) and electrical conductivity (228 μS). The presence of Tylenchulus semipenetrans and Radopholus similis, the main culprits of citrus nematode diseases, was confirmed, with severe root stunting and dieback observed in Palai Katlang. The study underscores the role of soil conditions, such as pH and texture, in influencing nematode survival and density. Recommendations for controlling nematode populations emphasize Integrated Disease Management (IDM) practices, including regular soil sampling and exploration of resistant citrus varieties. Further research is needed to develop effective control strategies to minimize the impact of nematodes on citrus crops.