Leaf Curl


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leaf curl

[′lēf ′kərl]
(plant pathology)
A fungus or viral disease of plants marked by the curling of leaves.

Leaf Curl

 

a widespread disease of plants, marked by the formation of protruding sections of the tissues of the leaves. These thickenings cause the leaves to curl, twist, and become wavy. The causative agents of leaf curl are fungi of the order Exoascales (leaf curl of peach, the Amygdalus, cherry, pear, black alder, Acer tatarica, birch, and poplar) and viruses (leaf curl of tobacco, cotton, sugarbeet, strawberry, potato, raspberry, and hop). Leaf curl is sometimes caused by insects, such as aphids (leaf curl of black, red, and white currants), or by mites.

The sources of the infectious principle in fungous leaf curl include the endogenous mycelium in branches and shoots and ascospores that have wintered under the glumes of buds and in cracks in the bark. The causative agents of viral leaf curl are transmitted during the vegetative reproduction of the plant and are spread by sucking insects (leafhoppers, aphids, and thrips) and mites.

Control measures include pruning and burning severely affected shoots; culling out sick plants (this method is used with plants that have viral leaf curl); early-spring spraying of fruit trees with fungicides; destroying weeds (reservoirs of viral infections), insects, and mites; and cultivating varieties that are resistant to leaf curl.

References in periodicals archive ?
The most destructive disease of which is the tomato leaf curl disease, which is transmitted by whiteflies.
Aftab Qamar in the subject of Molecular Biology after approval of her thesis entitled 'Search of Cotton Leaf Curl Virus Tolerant Gene (S) by Differential Display'.
Peaches and apricots grown against a fence or wall can be given some protection against peach leaf curl by erecting a rain shelter or plastic shelter.
Besides this, the cotton research body was also working with the federal and provincial agriculture departments to save crop from pink bollworm and Cotton Leaf Curl Virus (CLCuV) and arranging training and awareness programmes for farmers.
Cotton leaf curl disease is a major threat to cotton production in tropical and subtropical regions of the world.
In current study, IC-PCR was used for the detection of Tomato leaf curl New Delhi virus (ToLCNDV) from plant extracts of Nicotiana benthamiana plants inoculated with ToLCNDV.
He was addressing as chief guest at the sustainability meeting of the project, 'Improving Resistance to Cotton Leaf Curl Virus, supporting Cotton Best Management Practices for Small Farmers' held in Islamabad.
Viral sequences from radish were 99% identical to sequences of Tomato yellow leaf curl virus (TYLCV) and Chilli leaf curl virus (ChiLCV), from Oman.
ABSTRACT: Tomato (Solanum lycopersicum) production is affected by different diseases and Tomato yellow leaf curl virus (TYLCV) is the most prevalent and devastating begomovirus.
Recently, an alphasatellite associated with Okra leaf curl disease from West Africa (Kon et al.
Cotton growers feared 50 crop damage due to the cotton leaf curl virus (CLCuV) and whitefly attacks in Multan and Khanewal