7. Varietal resistance
Aphid density and plant damage under natural infestations have been used to select resistant sorghum genotypes in the greenhouse and field conditions (Setokuchi, 1976; Pi and Hsieh, 1982a; Hagio and Ono, 1986). Seedling and mature plant evaluations displayed similar results (Pi and Hsieh, 1982a; Hagio and Ono, 1986), however, seedlings were preferred for easy handling and control of infestation levels (Teetes, 1980).
7. Varietal resistanceAphid density and plant damage under natural infestations have been used to select resistant sorghum genotypes in the greenhouse and field conditions (Setokuchi, 1976; Pi and Hsieh, 1982a; Hagio and Ono, 1986). Seedling and mature plant evaluations displayed similar results (Pi and Hsieh, 1982a; Hagio and Ono, 1986), however, seedlings were preferred for easy handling and control of infestation levels (Teetes, 1980).
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