Early leaf spot

Bacterial leaf spot causes small, angular black spots on leaves. Leaves may turn yellow and drop early. Spray lime-sulfur every 10-21 days until leaf drop if weather is wet or humid, or if the spots are spreading. 

Clear up fallen leaves in fall, especially if currant leaf spot has caused early leaf-fall. 

Uses as fungicide to control early and late blights of potatoes and tomatoes anthracnose in cucurbits leaf spot diseases in many crops glume blotch of wheat also used on vegetables, ornaments, berry fruits, melons, coffee and tobacco, etc. 

Alternaria has been knovm for centuries to cause various plant diseases such as early blight of potato and various leaf spots and fruit rot. Species of this fungus are widely distributed in soil and on aerial plant parts. Because Alternaria requires high moisture levels (28-34%) for growth, infection of seeds occurs when the seed moisture is high, either in early stages of development or after wetting of crops from rain. 

Darline early, aromatic cultivar, light-coloured and firm fruits loose plant structure and rather low yields (reduce distance between plants). Thuriga medium ripening time, highly aromatic, large and firm fruits. Rather susceptible to leaf spot. 

Leaf surfaces pale powdery orange spots beneath. Cause Rust. Hollyhock s most common disease also deforms leaves and stems and causes early leaf drop. Its orange spots release fungal spores that spread via wind and rain. Grow resistant cultivars keep leaves dry and encourage good air circulation. In problem areas, apply wettable sulfur several weeks before rust normally appears. Remove and destroy infected plant parts. 

Leaves pale and mottled. Cause Lace bugs. These /s - A", dark-colored bugs have lacy wings. They feed on the undersides of leaves and deposit small black spots of excrement. Severe infestations can cause early leaf drop. Control by spraying leaves with superior oil or insecticidal soap. 

Leaves spotted, yellow, and drop early. Causes Septoria leaf spot anthracnose. Since both of these fungal diseases overwinter on old leaf litter, rake up the leaves or bury them under a thick mulch in autumn. Copper sprays also control both diseases. If defoliation occurs late in the season, it does plants little harm. 

To determine what is causing the injury, you need to look closely at the plant for more information. While some diseases may only cause a single symptom, such as leaf spots, many produce more than one indication of their presence. Finding these other clues can help you identify the problem quickly and accurately. And by being aware of common symptoms and signs of diseases, you ll be able to spot problems early on, before they get out of hand. 

Alternaria species are associated with several leaf-spot diseases of plants. Alternaric acid (8.10), produced by A. solani, which is the cause of early blight on potatoes and tomatoes, has a marked phytotoxic activity and may be responsible for many of the symptoms of the plant disease caused by the fungus. It also shows a specific anti-fungal activity. The branched chain structure is biosynthesized from nine acetate units and three Ci units derived from formate. The solanopyrones are another group of phytotoxic metabolites of A. solani. Solanopyrone A (8.11) induced necrotic lesions on the leaves of potatoes typical of this fungal infection. The structures of the solanopyrones were established by... 

Mancozeb is a fungicide used to control many fungal diseases such as blight, leaf spot, rust, downy mildew, and scab in field crops, fruits, nuts, vegetables, ornamentals, etc. In particular, it is used to control the following early and late blights of potatoes and tomatoes leaf spot diseases on celery, cucurbits, beets. 

Controls Anthracnose, Black Rot, Leaf Spot, Early and Late Blight, Downey Mildew. 

Leaves distorted, orange-yellow spots on leaf undersides. Cause Rust. This fungus produces orange pustules, distorting the leaves and making branch tips swell. Rust usually doesn t harm the tree much, except for detracting from the appearance. Clean up and destroy fallen leaves and branches in autumn. To prevent the spread of mild infections, spray leaves with sulfur early in the season. 

Leaves yellow plant dies early. Cause Dry rot. Other symptoms of this fungal disease include dry, brown or black, corky spots on corms and husk coverings. You may see black fungal growth spots on decayed leaf bases. Plants may turn yellow and die prematurely. Choose corms carefully to avoid infected specimens. Destroy infected plants. Do not replant in same area. Replant only in well-drained soil. 

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