Search results
Results from the WOW.Com Content Network
Pyrenophora seminiperda is a minor plant pathogen that causes leaf spots on many grasses. [1] It is an important generalist grass seed pathogen [2] which causes visible cylindrical masses of black fungal hyphae (stromata) to grow from infected seeds. Hence the common name "black fingers of death" [3] Pyrenophora seminiperda on Bromus tectorum seeds
In the head, threadlike sexual spores form, which are ejected simultaneously when suitable grass hosts are flowering. Ergot infection causes a reduction in the yield and quality of grain and hay, and if livestock eat infected grain or hay it may cause a disease called ergotism. Black and protruding sclerotia of C. purpurea are well known ...
They can cause plant disease and can infect a broad range of hosts in several monocot and dicot plant families. [3] Smuts are cereal and crop pathogens that most notably affect members of the grass family and sedges . Economically important hosts include maize, barley, wheat, oats, sugarcane, and forage grasses.
Fairy rings are detectable by sporocarps (fungal spore pods) in rings or arcs, as well as by a necrotic zone (dead grass), or a ring of dark green grass. Fungus mycelium is present in the ring or arc underneath. The rings may grow to over 10 metres (33 ft) in diameter, and they become stable over time as the fungus grows and seeks food underground.
Leaf spots can vary in size, shape, and color depending on the age and type of the cause or pathogen. Plants, shrubs and trees are weakened by the spots on the leaves as they reduce available foliar space for photosynthesis. Other forms of leaf spot diseases include leaf rust, downy mildew and blights. [4]
Turf melting out begins as black to purple spots on the leaf blades. These spots eventually appear on the leaf sheaths. The fungus then begin to move down and invade the crowns and the roots of the plants. From far away, the turf appears yellow or blackish brown. The colors that appear on the turf directly reflect the nitrogen levels in the ...
Exposure to oxygen can also cause grass seeds to go bad faster, so transferring seeds from paper packaging to an airtight container can extend their viability. 4. Go Dark
This is the result of the turf in the center surviving or being recolonized by healthy grass (3). While the infection happens during cooler seasons, such as fall and spring, the symptoms can carry into summer (7). Should the disease continue through the summer, it may cause the crown and roots to become blackened with visible mycelium (11). As ...