C. Tortoe^1,, S. Dowuona¹, N. T. Dziedzoave¹

Yams (Dioscorea spp.) are an important economic crop in Ghana. The formation of buds and subsequent sprouting of yam tubers influences postharvest losses. Efforts to prolong dormancy and inhibit bud and sprouting are therefore laudable. Seven key yam varieties of farmers identified as Pona, Lariboko, Dente, Mutwumudoo, Serwah, Matches and Akaba in Ghana were subjected to plant extracts from cocoa pod (Theobroma cacao) potash, neem (Azachirata indica) seeds, neem (Azachirata indica) leaves, sweetpotato (Ipomoea batatas) leaves to inhibit bud and sprout formation. The potash extracts suppressed bud formation in Mutwumudoo, Akaba and Matches compared to Lariboko and Serwah yam varieties. In a descending order of Lariboko, Matches, Mutwumudoo, Serwah, Pona, Dente and Akaba, neem seed extracts was able to suppress bud formation and subsequent sprouting. In neem leaves treatment, suppression of bud formation was highest in Lariboko, Dente, Mutwumudoo, Akaba, Matches, Serwah and Pona in a descending order. Sweetpotato leaves suppression of bud formation was highest in Serwah, Akaba, Mutwumudoo, Dente, Matches, Lariboko and Pona as the least. The control treatment showed higher number of buds formed in all the yam varieties in a descending order of Akaba, Serwah Mutwumudoo, Lariboko, Dente, Pona and Matches as compared to all the other treatments. The four plant extracts effect on bud formation and subsequent sprouting on the seven varieties of yam was comparable (p = 0.05). The control, sweetpotato and neem leaves plant extract performed poorly as compared to the potash and neem seed extracts. Interestingly, potash was the best bet plant extract in reducing bud formation and sprouting (0.26) while sweetpotato leaves was the least (0.42) and corresponding yam varieties was Mutwumudoo followed by Matches and Akaba.

yam, dormancy, bud, sprout, cocoa, potash, neem, sweetpotato, plant extracts