Shallot (Allium cepa var. aggregatum) is an important commercial crop in Southeast Asia. In Thailand, it primarily grown the north-eastern and northern regions, with planting areas yields 2021 of c. 9,560 ha 0.16 million tonnes per year, respectively (Office Agricultural Economics, 2021). Damage to shallot caused by root-knot nematodes has been reported Wiang Chai district, Chiang Rai province,...
