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Prevention of leaf spot disease includes variety selection, crop rotations, plant hygiene and fungicide use for seeds and foliage. [19] To stop the spread of pathogens good sanitation is key as well as the avoidance of handling plants when wet, planting pathogen-free and resistant cultivars and moving out infected plants. [ 20 ]
Without control leaf spot is estimated to be able to reduce yields by up to 50%. [65] Alternaria leaf spot is controlled using the same treatment as downy mildew: applications of azoxystrobin, copper, chlorothalonil, mancozeb, and maneb beginning midseason.
For commercial growers, the disease is primarily controlled by use of fungicide sprays. Fungicides are much more effective when applied early in the season when the inoculum load is low as cherry leaf spot is a prolific, unrelenting, tireless disease. Fungicide applications should begin at petal fall or shortly after leaves have unfolded.
SC 407 have been proven to be common corn variety that are resistant to grey leaf spot. [19] If grey leaf spot infection is high, this variety may require fungicide application to achieve full potential. [20] Susceptible varieties should not be planted in previously infected areas (see § High risk above). [21]
Nevertheless, fungicides, such as the protectant fungicide, chlorothalonil, have been the standard for control leaf spots since the mid-1970s and is still widely used today. [4] Tebuconazole , a systemic ergosterol biosynthesis-inhibiting fungicide, and pyraclostrobin , a strobilurin -type fungicide have also both proven effective in ...
Gray leaf spot, known as Pyricularia grisea, is an ascomycete fungus that is known only by its anamorph form. The teleomorph phase (perfect sexual phase) has not been observed in turf but is predicted to use perithecium as the ascocarp structure to form ascospores.
Cercospora is a genus of ascomycete fungi. Most species have no known sexual stage, and when the sexual stage is identified, it is in the genus Mycosphaerella. [2] Most species of this genus cause plant diseases, and form leaf spots.
A raspberry leaf spot infection initially causes dark green circular spots on the upper side of young leaves, which will eventually turn tan or gray. [3] These spots are typically 1–2 millimetres (0.039–0.079 in) in diameter, but can get as big as 4–6 millimetres (0.16–0.24 in). [4] These spots can also fall out, causing a shot effect.
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