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Vaccinium spp.
Growing calendar
Typical timing for central Japan (Kanto region). Shift it for your own climate, and record your actual dates.
Guides
- Blueberry Soil pH: How to Acidify Soil and Fix Yellow Leaves
- How to Plant Blueberries: Bed Preparation, Spacing and Depth
- How to Prune Blueberries: Which Canes to Cut and When
- Watering Blueberries: How Much, How Often and Reading the Leaves
- Blueberry Growing Calendar: What to Do Season by Season
- When to Pick Blueberries: Judging Ripeness and Getting the Sugar Up
Common problems
Start from what you can see on the plant.
Pests and diseases (27)
Problems recorded for this plant, most serious first.
Iron Deficiency
MajorDisorder
Yellow-white interveinal chlorosis begins on the new leaves with only the veins staying green. In severe cases the new leaves bleach entirely white and growth stops.
Scale Insects
CommonPest
Small white or brown shell-like insects dot the shoots and leaves. The plant loses vigor and honeydew-fed sooty mold blackens the shoots and foliage.
Waterlogging Root Decay
CommonDisorder
The plant wilts even though the soil never dries, and the lower leaves yellow. Pull it up and the roots have turned brown to black with a distinctive rotten smell.
Longhorn Beetles
CommonPest
Sawdust-like frass is pushed out at the trunk base or branch crotches. The wood is hollowed out, the tree loses vigor, and the trunk may snap in strong wind.
Scarab Grubs
CommonPest
The plant wilts despite watering and growth halts abruptly. Lift the plant and there are almost no roots; dig into the soil and white C-shaped grubs appear.
Root Bound
CommonDisorder
Leaves wilt even right after watering and roots push out of the drainage holes. Water runs off the surface instead of soaking in, foliage pales and growth stops.
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.
Nettle Caterpillars
OccasionalPest
From summer into autumn they cluster on leaf undersides and graze the tissue so the leaves turn translucent white. Larger larvae riddle the leaves with holes and strip the branches bare.
Brown Leaf Spot
OccasionalDisease
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.
Mealybugs
OccasionalPest
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.
Fruit Borers
OccasionalPest
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.
Bagworms
RarePest
Bag-shaped cases covered in twigs and leaf fragments hang from the branches. Leaves are eaten irregularly and heavy infestation leaves the branch tips bare.
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.
Sclerotinia Rot
Disease
The crown, stem or head rots in a water-soaked way and is covered in white cottony mycelium. Black sclerotia later form inside and on the surface, and the plant wilts and dies.
Anthracnose
Disease
Light brown to dark brown round lesions with sharp margins form on leaves and fruit, slightly sunken in the center. In wet weather salmon-pink slimy spore masses ooze out on the lesions.
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.
Leaf Spot
Disease
Small round brown to gray-white lesions appear on the lower leaves, the centers turning gray with tiny black specks. As they multiply the leaf yellows and drops early.
