The use of nematicides to control nematodes has adverse environmental
effects and is too costly for subsistence farmers. A promising alternative is the use
of nematode-resistant varieties. Such varieties can be obtained by selecting for the
highest available resistance from among existing genotypes or by classical
breeding. In both cases, the first step is the screening of germplasm for sources of
resistance to nematodes. Resistance to A. besseyi is said to be genetically controlled
and carried by the Japanese cv. Asa-Hi (Nishizawa, 1953).