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Within the Compact Type family, this group has very long winter dormancy, late spring green-up, very dark green turf color, good heat tolerance, but are susceptible to powdery mildew.
Within the Compact Type a number of varieties exhibit growth and performance similar to American. These varieties have fine leaf texture and higher tiller density than other compact type varieties. American Types in contrast to Midnight Types have good resistance to powdery mildew.
This group has high speed yield potential and generally produces medium to good quality turf in the absence of stripe smut. The BVMG Types generally are very stemmy in early spring. This group also has poor winter color, long winter dormancy, and suffers from significant billbug damage.
Similar to the BVMG Types with high seed yield potential, but unlike the BVMG, Shamrock types exhibit good resistance to stripe smut.
Low compact growth and good leaf spot resistance. This group has long winter dormancy (except P-105) and good stripe smut resistance.
This group forms vigorous turf of medium density with deep, extensive root and rhizome systems. This group has moderate susceptibility to leaf spot, but has excellent ability to recover from leaf spot and other stress due to the deep extensive rhizomes system. This group has great tolerance to heat and summer stress.
Generally erect growing types with narrow leaf blades. All common types are susceptible to leaf spot and may be extensively damaged by this disease during the cool, humid conditions of winter and spring.