BYGL Disease Digest May 8, 2008 MOIST CHAMBER
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Other plant diseases noted by BYGLers around the state include: *CEDAR QUINCE RUST, with bright orange masses of fungal spores is evident on juniper stems and these spores are being disseminated to hawthorns, where the fungus causes infections mostly on the developing fruits. MAY-APPLE RUST is starting its annual show up on this woodland wildflower. *Disease samples noted in the CWPPDC include: SPHAEROPSIS TIP BLIGHT on Pine (Austrian, Scots) from infections last season, though infections (but not yet symptoms) are occurring on new growth this year as candles emerge and elongate; DOTHISTROMA NEEDLE BLIGHT on red pine; BLACK ROOT ROT on holly; and VOLUTELLA LEAF BLIGHT AND STEM CANKER ON PACHYSANDRA. Volutella often develops in spring on plants injured by other factors. Cold temperature injury this winter and spring may be a factor in development of this disease. Other diseases noted by BYGLers include ASH ANTHRACNOSE in southern Ohio and SEPTORIA LEAF SPOT OF DOGWOOD in central Ohio. *And, yes, we have NO APPLE SCAB symptoms on nursery trials of crabapples in Circleville in central Ohio and at the Crablandia plots at Secrest Arboretum in Wooster - but infection periods have occurred and infections have probably started already. Many landscape managers time the first fungicide spray for scab on crabapples at petal fall, so that time has arrived or is past in much of the state for many crabapple taxa. Some FROGEYE LEAF SPOT disease is evident, with small tan spots with purple borders showing on leaves from infections occurring from spores in overwintering cankers and fruits on the trees.
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| Last Updated ( Thursday, 08 May 2008 19:46 ) |
