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The main symptoms of Ditylenchus destructor, common to potatoes and its other hosts, are the rotting and discoloration of subterranean plant tissue. In potatoes, early infection can be detected by small white spots underneath the potato's skin. As the disease progresses, these spots become larger and darker with a spongy or hollow appearance. [7]
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The pronotum and wing covers are covered in dense, short greyish hairs. The larva is known as a wireworm and lives in the soil. It is yellow, slender, stiff and leathery, and grows to a length of about 20 mm (0.8 in). The centre of the mandible has a small tooth for gnawing. [3]
If possible, ask for seed potatoes grown on fields which were declared free of the potato cyst nematode. Pesticides can be used, but they will not get a field free of nematodes. They will increase yields and are only profitable at high population densities, when the financial profit of the extra yield will surpass the cost of the pesticide ...
As S. subterranea infects the roots of potatoes, the virus is given access to the root cells and starts its habitation of the plant. By taking control of the cell's cellular machinery, the virus can replicate. The virus then moves onto more potato cells and spreads systemically through the plant.
Control of aphids with insecticide application is the only means of managing this problem in production years that are highly favorable for aphids. Seed borne infection generally results in small, stunted, badly impaired plants which have reduced yield both in tuber numbers and in tuber size.
In a lab cultured sample taken from black dot of potatoes, conidia grew best at 82.4 F and a pH of 6. [1] High humidity and temperature are conducive to the inoculation of black dot. [ 4 ] The disease is spread more quickly when there are many sclerotia in the soil, rather than when the foliage is inoculated by conidiospores.
Monocrepidius falli, the southern potato wireworm, is a species of click beetle in the family Elateridae. References This page was last edited on 12 October ...
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