sentences:  Bt engineered corn has been seen to have a greater proportion of stalk rot and be more susceptible to "C. graminicola" compared to strains without Bt.Once conidia germinate on corn leaves, a germ tube differentiates and develops into an appresoria and allows "C. graminicola" to penetrate epidermal cells.Germination and appressorium formation occur best in the temperature range (15-30°C) Penetration occurs in a much narrower temperature range (25-30°C).