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Occurrence and Proposed Cause of Hollow Husk in Maize

University of Illinois, Crop Science Dep., 1201 W. Gregory Dr. Urbana, IL 61801

View larger version (31K): [in this window] [in a new window]   Fig. 1. The dates, amounts of precipitation, and daily temperature extremes at the experimental site during the 2007 growing season. The daily high temperature is indicated by a solid line and the low temperature by a dashed line. Bars represent the total precipitation on a given day. The occurrence of the growth stages and when the treatments were applied are shown at the top of the figure.

View larger version (87K): [in this window] [in a new window]   Fig. 2. (A) Comparison of a normal ear (top) and an ear exhibiting hollow husk (bottom) and (B) husked ears showing the potential differences in the severity of hollow husk symptoms where ovule development is not visible (far left) to varying degrees of ovule formation. Pictures were taken on 21 July 2007 at the R2 growth stage. Scale is indicated to the left, where one bar is equivalent to 1 cm.

View larger version (28K): [in this window] [in a new window]   Fig. 3. The effect of plant population and an application of strobilurin fungicide at V11 on the time course of (A and B) silking and (C and D) pollen shed in 2007. Bars indicate standard error and stars indicate significant differences from the untreated control (UTC) at the 5% confidence level. The UTC is represented by black circles, while strobilurin fungicide treated is represented by white circles.