spores oospores

Listing 1 - 10 from 14 for spores oospores

nvps journal:PRELIMINARY REPORT ON STEM AND ROOT ROT OF VIOLA AND PANSY
... Solberg (including a species with spiny oogonia (Fig 1A (A1-5) and one with small oospores (Fig 1A (B1-4)), in several varieties but the most common species is Pythium type ... the average diameter of the oospores (or resting spores) (Fig 1.C) developed upon maize extract agar (D-21, E-20, H-19.5 microns). Conidia (asexual spores) (Fig 1.D) of E ...
myweb.tiscali.co.uk

Red Stele Root Rot of Strawberry, HYG-3014-95
... as thick-walled resting spores (oospores). When the soil is moist or wet, some of the oospores germinate and form structures called sporangia, which are filled with the infectious spores of the fungus (zoospores ... thereby continuing to spread the disease. The fungus produces oospores within infected roots as they begin to rot and die, and these oospores are released into the soil when the roots ...
ohioline.osu.edu

Phytophthora Root and Crown Rot of Fruit Trees, HYG-3029-95
... spores (oospores). Oospores remain viable in the soil for long periods of time (years). When soils are wet, oospores germinate to form thread-like fungal filaments (mycelia). Mycelia from germinated oospores ...
ohioline.osu.edu More from this site

Vegetable Crops - pt 5
... rains that deposit soil and oospores on the young plants. The fungus oversummers in soil as dormant thick-walled oospores and may spread within a field by windblown spores. Free moisture on ... environmental conditions. The fungus overwinters in living spinach plants and in the seed. The fungus spores require surface moisture for development. Optimum temperature is around 48 degrees F for germination ...
plantpathology.tamu.edu

APSnet Education Center - Lab Exercise - Oomycetes
... and heterothallic species, fertilization results in a thick-walled zygote called an oospore. Oospores function as resting spores. They are produced in infected plant tissue, and are released into soil ... under a dissecting microscope for oogonia, antheridia, and oospores. Note the location of the antheridium in relation to the oogonium. How do oospores differ from oogonia? 2. Examine prepared slides ...
www.apsnet.org

Fruit Disease Focus - Phytophthora Root, Crown and Collar Rots  - June, 1998
... wet or saturated. The Phytophthora fungi persist in the soil mainly as dormant resting spores (oospores, chlamydospores) or in a vegetative growing form within infected plant tissue. When the soil ... , reproductive structures (sporangia; Fig. 7) are produced, either as the result of germinating resting spores or as direct outgrowths of the active fungus within infected roots and crowns. These ...
www.caf.wvu.edu

template
... ) enclosed in an oogonium (female) by an antheridium (male). 2. During asexual reproduction zoospores (motile spores) are formed within a zoosporangium that is produced on a sporangiophore. 3. Coenocytic vegetative hyphae ... to the oogonia. An oospore. Note that the wall of the oogonium is still evident. Oospores may germinate directly by the production of a hypha or indirectly (as shown here) by ...
www.cals.ncsu.edu

Michigan Grape Society Newsletter, Volume 4 Issue 3, July 2003
... while frequent rains may actually lower disease incidence by washing powdery mildew spores off the leaves and causing bursting of spores in water droplets. While the humidity may have been adequate, the ... as temperatures and moisture levels in spring and early summer appeared favorable for germination of oospores that overwintered in the soil. Regular rain events in the spring and early summer also ...
www.canr.msu.edu

Pythium root rot in tobacco greenhouses
... produce sporangia, the fruiting body. The sporangia will form zoospores (spores that are motile and are able to swim in the ... this system. Pythium will also form resting structures (chlamydospores and oospores) that will allow them to survive for long periods in ... 6) Symptoms on plants (Figure 7, 8) Pathogen structures Sporangia, zoospores, oospores (Figure 9, 10, 11, 12) Back to: Plant Disease ...
www.ces.ncsu.edu

SuddenOakDeath
... probably in soil carried on vehicles, machinery, footwear or animals. Two different types of asexual 'spores' called sporangia and chlamydospores are formed. In the USA, these are produced abundantly on ... canker surfaces of Quercus and Lithocarpus). The pathogen may also form long-lived resting sexual spores (oospores) if the two 'opposite' mating types (A1 and A2) are present. Until recently, only ...
www.the-tree.org.uk

These listings are filtered
View all for spores oospores