ring spot

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Related to ring spot: dollar spot, necrotic ring spot

ring′ spot`

any of various viral or fungal plant diseases characterized by concentric rings of discoloration or necrosis on the leaves.
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References in periodicals archive ?
In 1982, a young lady researcher at the Institute of Plant Breeding at UP Los Banos took upon herself to start a research project that would address the papaya ring spot virus (PRSV) that had practically wiped out the papaya plantations in Cavite.
Another common and more serious turf problem is "frog eye" or Necrotic Ring Spot (NRS).
The papaya strain of Papaya ring spot virus (PRSV), that causal agent of PRSV disease was confirmed in Malir District Sindh and in Islamabad by double antibody sandwich enzyme linked immunosorbant assay (DAS-ELISA).
Necrotic ring spot, mildew, as well as root and crown rots flourish in cool weather on saturated soils.
Beyond exhibited good resistance to leafspot [caused by Drechslera poae (Baudys) Shoem] and necrotic ring spot [caused by Ophiosphaerella korrae (J.C.
Signum, from BASF, contains the two new active ingredients Boscalid and Pyraclostrobin (F 500) to achieve a new high standard of control of Botrytis in outdoor strawberries and of Ring Spot, Dark Leaf Spot and White Blister in the listed brassica crops.
He is maintaining his threat to quit because of disillusionment with the system put in place by the NJPC, but until he is satisfied with the sale system, he will use his lowly ring spot at Ludlow as a first toe in uncharted waters.
The ring spot virus may therefore cease to be a problem in papaya.
They have also observed it to be resistant to squash leaf curl virus, zucchini yellow mosaic virus and papaya ring spot virus.
Cabernet exhibited very good resistance to necrotic ring spot [caused by Ophiosphaerella korrae (J.C.
ON PAPAYA RING SPOT VIRUS - This disease is prevalent in many places in Luzon like the Calabarzon provinces, in Mindoro and Palawan.