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Leaf spot caused by Botrytis infection occurs in young , tender seedlings or when infected flower petals contact the plant leaves . In this first of three images , observed fringes for the Eureka Valley earthquake are formed by stacking two interferograms ; one fringe represents 14 mm of range change in all three panels because the stacking procedure doubles the earthquake signal . We actually know much less about the surface topography of the Earth than of Venus , due to the recent success of the Magellan mission and the fact that two-thirds of the Earth is covered with water . Leaf spotting is more common during wet seasons . Girdled stems die and their brown foliage is quite obvious . They've also been seen in St. Paul , Stillwater , Hastings , Rochester and Winona , according to Doree Maser of the Minnesota Department of Agriculture .