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Helianthus tuberosus is a herbaceous perennial plant growing to 1.5–3 m (4 ft 11 in – 9 ft 10 in) tall with opposite leaves on the lower part of the stem but alternate towards the top. [7] The leaves have a rough, hairy texture. Larger leaves on the lower stem are broad ovoid-acute and can be up to 30 cm (12 in) long. Leaves higher on the ...
The artichoke (Cynara cardunculus var. scolymus), [1] also known by the other names: French artichoke, globe artichoke, and green artichoke. In the United States, [2] it is a variety of a species of thistle cultivated as food. The edible portion of the plant consists of the flower buds before the flowers come into bloom.
The plant can achieve a height of 30 cm (12 in). Weeding is necessary but it is important not to damage the root system. A sufficient water supply during summer is important. [9] Harvest is from November to March. It is important that the soil is not frozen when harvesting. [10] The storage of S. affinis tubers is difficult. Because of their ...
Infested water can also be spread by way of irrigation or transplanting. Blowing rain can also spread fungi and bacteria. [2] Splashing water can also spread pathogens from the soil to leaf and amongst leaves. [8] Plant material can also be the cause of leaf spot disease. These include infected seeds, transplants and discarded culls and leaves. [2]
Ditylenchus dipsaci is a plant pathogenic nematode that primarily infects onion and garlic. [2] It is commonly known as the stem nematode, the stem and bulb eelworm, or onion bloat (in the United Kingdom). [3] [4] Symptoms of infection include stunted growth, discoloration of bulbs, and swollen stems.
The symptoms include leaf chlorosis, stunting, and leaf drop. It is transmitted through the soil and through vascular wounds in plant material. Fusarium oxysporum f. sp. canariensis causes wilt of Canary Island date palm and other propagated palms. The disease is spread through contaminated seed, soil and pruning tools. [6]
Gummy stem blight is a cucurbit-rot disease caused by the fungal plant pathogen Didymella bryoniae (anamorph Phoma cucurbitacearum). [1] Gummy stem blight can affect a host at any stage of growth in its development and affects all parts of the host including leaves, stems and fruits. [1]
Anguina tritici was the first plant parasitic nematode to be described in the literature in 1743. It causes a disease in wheat and rye called "ear-cockle" or seed gall. . Originally found in many parts of the world but has been eradicated from the western he