Root systems of these yellowing seedlings were not the same as normal seedlings, attached with root nodules. These root nodules are caused by root-knot nematodes.
Root nodules on rice
Abundant root-knot nematodes were found in soil. Rice root-knot nematodes are small and invisible to the naked eye. It mainly parasitizes roots and absorbs nutrients from plants. Root-knot nematodes irritate roots and cause plant tissue to swell.
Common root-knot nematode species that harm rice are Pseudograss root-knot nematodes, southern root-knot nematodes, Java root-knot nematodes, rice root-knot nematodes, and peanut root-knot nematodes. All of these root-knot nematodes cause root nodules to rice.
Established for more than 20 years, BrightMart has been dedicated on nematodes control. It is recommended to BrightMart’s nematicide ‘Duofu’ (water-soluble) granules, which is an outstanding nematicide with slow release carrier technology gives effective protection for new and old roots.