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ARET, Annual Report 2001, p. 3-6.

Evaluation of varieties for resistance to fusarium wilt

ANON.
ARET, Agricultural Research and Extension Trust, Lilongwe, Malawi
The trial was conducted during the 2000-2001 season at Kandiya, Kabwafu, Mitundu and Mgodi in a randomised complete block design replicated three times. The plot size was two ridges spaced at 120 cm apart with interplant spacing of 60 cm. Each plot had two ridges with 12 plants on each ridge and a net plot of 20 plants from which yield and fusarium wilt scores were collected and quality as well as returns per hectare derived. The yield and quality parameters were analysed and pooled over sites. The crop was rain planted. However, the crop stand at Kandiya and Mitundu was planted late because the season started early. All other cultural practices were done as recommended. Data on fusarium wilt were collected by recording the proportion of infected plants per entry. Fusarium wilt resistance was measured on a scale of 0-100%, where 0% meant resistant and 100% represented no resistance. The test entries were TN86 x B84-1085, Sevilla 8, CMS Jaraiz and GR90-3380-5, LR1 Nkhotakota, LR2 Mangochi, LR3 Masanje and KR4 Dowa. B. Special and KBM 33 were susceptible controls while B84-1052 was a resistant control. At Kandiya and Mitundu, the crop stand was infected by bushy top as planting was done late due to early start of rains. This might have affected the yields obtained. No incidences of fusarium wilt occurred at Mitundu and Kabwafu. Mgodi site was abandoned later in the season as all plants perished. At Kandiya "sick plot" there was significant difference in the incidences of fusarium wilt among the test entries (Table 1.1). TN86 x B84-1085, Sevilla 8, CMS Jaraiz, GR90-3380-5 and B84-1052 were rated resistant to fusarium wilt.