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Vitis vinifera
Growing calendar
Typical timing for central Japan (Kanto region). Shift it for your own climate, and record your actual dates.
Guides
- How to Plant a Grape Vine: Spacing, Soil and the First Two Years
- Pruning Grapes in Winter: Spur Pruning and Cane Pruning Explained
- Grape Vine Care Through the Season: Watering, Feeding and Thinning Bunches
- The Grape Growing Year: What to Do at Each Stage from Bud Break to Dormancy
- Grape Vine Problems: Mildew, Black Rot, Birds and What to Do About Them
- When Are Grapes Ripe? How to Tell, How to Pick and How to Keep Them
Common problems
Start from what you can see on the plant.
Pests and diseases (95)
Problems recorded for this plant, most serious first.
Mealybugs
CommonPest
White cottony masses appear at leaf axils, on fruit clusters and at the edge of the potting soil. Sap feeding weakens growth and the honeydew leads to sooty mold.
Crown Gall
CommonDisease
Irregular galls form at the crown and on the roots, gradually enlarging and turning woody. They block the flow of water and nutrients, so the plant loses vigor and may die.
Fruit Borers
CommonPest
Small entry holes with gummy exudate and frass appear on the fruit surface. On new shoots the tips wilt and die back and the inside is hollowed out.
Leafrollers
CommonPest
Leaves are webbed into tubes or folded in half, with a green or brown caterpillar inside. Shoot tips and fruit surfaces are also gnawed, disrupting growth.
Downy Mildew
CommonDisease
Pale yellow to yellow-brown angular lesions form on the upper leaf surface with a gray-purple mold in the matching spot underneath. Lesions merge, the leaves die back and the plant declines early.
Fruit Cracking
CommonDisorder
Radial or concentric cracks open around the shoulder and calyx of the fruit. Rot organisms enter through the cracks and the fruit spoils quickly.
Magnesium Deficiency
OccasionalDisorder
Yellowing appears between the veins of the lower leaves while the veins stay green, giving a net-like pattern. It later browns and dies back, and is most obvious on plants carrying a heavy fruit load.
Violet Root Rot
OccasionalDisease
The tree gradually loses vigor and the leaves shrink, sometimes wilting abruptly in summer. A purple-brown or white mycelial mat covers the root surface and the bark peels away easily.
Powdery Mildew
Disease
White patches appear scattered on the upper leaf surface at first, then the whole leaf is coated in a white powder. Leaves later yellow, brown and die back, and reduced photosynthesis cuts growth and yield.
Brown Leaf Spot
Disease
Small light brown to gray-brown spots form on the leaves and enlarge into irregular lesions. When they merge the whole leaf dies and plant vigor drops sharply.
Black Rot
Disease
V-shaped yellowing spreads inward from the leaf margins and the veins darken into a black network. As it advances the whole plant wilts and dies.
Black Spot
Disease
On roses, dark brown lesions with radiating edges form on the leaves, which yellow around them and drop. On pear, sooty black lesions appear on leaves, fruit and the calyx of young fruit, deforming the fruit.
Rust
Disease
Small raised orange-yellow to red-brown pustules form on both leaf surfaces, then rupture and release powdery spores. Heavy infection yellows the leaves and kills them early.
Southern Blight
Disease
The stem rots at soil level and white silky mycelium spreads over the crown and the surrounding soil surface. Brown sclerotia the size of rapeseed then form and the plant wilts and dies rapidly.
Sooty Mold
Disease
A thin black sooty mold spreads over the upper leaf surface, shoots and fruit. It does not invade the tissue itself, but it blocks photosynthesis and badly spoils appearance.
Fusarium Wilt of Cucurbits
Disease
Part of the vine wilts during the day and eventually the whole plant dies. The stem splits lengthwise near the soil and exudes gum, and the vascular tissue is browned when cut.
Root-knot Nematode
Pest
The plant wilts in the daytime and does not recover with feeding or watering. Pull it up and the roots carry beaded chains of galls of varying size with few fine roots.
Gray Mold
Disease
Water-soaked brown lesions form on flowers, fruit and leaves, densely covered by a fuzzy gray mold. Fruit rots and drops, and decay continues in storage after harvest.
Brown Rot
Disease
Blossoms brown and die, and round brown lesions on fruit expand rapidly. Grayish white powdery mold forms in concentric rings on the lesion and the fruit finally dries into a hard mummy.
Verticillium Wilt
Disease
Only one side of the lower leaves yellows and wilts, and the symptom moves up the plant. Stem vascular tissue turns pale brown and the plant dies without ever growing well.
Bacterial Spot
Disease
Small water-soaked spots appear on the leaves, later turning brown with yellowing around them. Fruit develops water-soaked or scabby spots from which rot spreads.
Ring Rot
Disease
The bark of branches and trunk becomes rough and warty, serving as the inoculum source. Fruit develops round brown lesions that soften and rot in concentric rings.
