Hops Field Manuals

Nitrogen Deficiency
Growth is dwarfed and thin. Plant is light green in color overall, turning…
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Phosphorus Deficiency
Leaves are smaller, dark olive green and have a dull appearance. They can…
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Potassium Deficiency
The first symptoms are downward culing of the leaf, associated with a…
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Magnesium Deficiency
The first visual symptoms show up as a bright yellow chlorosis (yellowing)…
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Calcium Deficiency
Tip growth is weak and the leaves are small. Margins of the leaves turn…
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Iron Deficiency
The youngest leaves at the top of the plant show symptoms first by turning…
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Zinc Deficiency
Zinc Deficiency will appear on hops as soon as they emerge from the…
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Boron Deficiency
Boron deficiency appears in the spring. Growth is uneven, shoots are thick…
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Molybdenum Deficiency
White speckling, necrosis (dead tissue) and upcurling of leaves. As…
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Frost Injury
The shoots are stunted, the inernodes are very short and the leaves do not…
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Verticillium Wilt (Verticillium albo-atrum)
The first symptoms appear on the older leaves of the main vine. The leaves…
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Phytophthora Crown and Root Rot (Phytophthora cactorum)
Symptoms appear in mid-summer on plants scattered throughout the yard or…
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Virus
Symptoms become particularly common during cool periods following a period…
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Downy Mildew (Pseudoperonospora humuli)
The downy mildew fungus infects both above- and below-ground portions of…
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Twospotted Spider Mite (Tetranychus urticae)
A serious pest of hops grown in the warm dry interior valleys of the…
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Mite Webs
Part of the reason mites are difficult to control is due to the webbing.…
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Mite Damage
Mites damage hop leaves by inserting needle-like mouthparts into plant…
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Mite Cone Damage
Mite-damaged cones turn rusty red and are considered culls by the brewing…
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Black Vine Weevil (Otiorhynchus sulcatus)
A flightless beetle about 1/2 inch long. The fused wing covers have…
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Black Vine Weevil Larvae
Cream-colored, C-shaped grubs, the larvae feed on underground roots and…
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Hop Aphid (Phorodon humuli)
A frequent pest on hops. It passes the winter as an egg on woody hosts of…
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Sooty Mold Fungus
In addition to the feeding injury, aphids secrete "honeydew" on leaves and…
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Ladybird Beetles (Hippodamia convergens)
Numerous beneficial predatory insects are associated with large…
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hoverfly Larvae (Diptera Syrphidae)
Larvae of the hover fly also feed extensively on hop aphids. The brightly…
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Hop Looper (Hypena humuli)
The adult hop looper is a greybrown moth. The larvae are slender, pale…
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Lepidopterous Larvae: Green fruitworm, Bertha armyworm
Closer to harvest several other lepidopterous larvae may occur in large…
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