See: Varietal Publication No. CXXIII, April,
1987
Maricopa has high resistance to spotted alfalfa
aphid, pea aphid, Southern root--knot nematode, and Fusarium wilt; resistance
to blue alfalfa aphid, Phytophthora root rot, and stem nematode; moderate
resistance to bacterial wilt and Verticillium wilt; low resistance to anthracnose.