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A-Z list of horticultural diseases and disorders

The following are the main diseases and disorders that attack fruit and vegetable crops in Queensland.

Diseases and disorders are listed alphabetically by common name.

For specific chemical control options, visit the Australian Pesticides and Veterinary Medicines Authority (APVMA) website.

  • Infected plant Alfalfa (lucerne) mosaic

    The horticultural disease alfalfa (lucerne) mosaic has a wide range of hosts among legumes and other broad-leafed plants.

  • Infected fruit Anthracnose

    Information on Anthracnose, which affects rockmelon, honeydew, tomato, chilli, capsicum, avocado, citrus, mango, cashew, passionfruit, banana and most other tropical crops.

  • Infected tree Armillaria root rot

    Information about the horticultural disease Armillaria root rot, which affects apple, banana, citrus, custard apple, grape, macadamia, pear and stone fruit.

  • Infected tree Bacterial blight

    Information on bacterial canker in fruit trees, which affects mango, stone fruit, pear and beans.

  • Infected plants and stems Bacterial canker in vegetables

    Information on Bacterial canker, which affects tomato, capsicum, chilli and capsicum.

  • bacterial fruit blotch on fruit Bacterial fruit blotch

    Information on Bacterial fruit blotch, which affects watermelon, honeydew, rockmelon; weeds such as wild cucurbits, paddy melon and prickly paddy melon; tomato and eggplant can become infected under glasshouse conditions.

  • Internal damage to avocado fruit Bacterial soft rots

    Information on Black leg X (bacterial soft rots), which affect potato, lettuce, sweetpotato, tomato, capsicum, avocado and banana.

  • Two images depicting the early onset of the bacterium and a sample with advanced symptoms Bacterial spot

    Bacterial spot affects many fruit and vegetable based crops and is a serious disease.

  • Severe symptom on the underside of leaves Basil downy mildew

    Basil downy mildew is a serious disease of basil.

  • Infected plants Bacterial wilt

    Information on Bacterial wilt, which affects potato, tomato, egg fruit, capsicum and custard apple.

  • Infected and healthy plants Black root rot

    Information on Black root rot, which affects a wide range of crops including lettuce, bean, watermelon, rockmelon, cucumber, tobacco, sweet pea and pansy.

  • Infected fruit Botrytis (grey mould)

    Information on Botrytis (grey mould), which affects tomato, bean, capsicum, cucumber, brassicas, lettuce, onion, grapes, strawberry, mango and macadamia.

  • Infected fruit Cercospora leaf spot

    Cercospora leaf spot affects bean, beetroot, capsicum, okra, silver beet, watercress, carrot, avocado and coffee.

  • Affected seedlings compared to healthy ones Damping-off

    Information about damping-off, which is the destruction of seedlings by pathogens. Seedling plants of almost all fruit, vegetable, field and ornamental crops are liable to attack.

  • Infected leaf Downy mildew

    Information on Downy mildew, which affects curcubits, grape, lettuce and onions.

  • Infected potato tubers Fusarium rot

    Information on Fusarium rot, which affects potato, rockmelon and sweet corn.

  • Infected fruit Fusarium wilt (yellows)

    Information on Fusarium wilt, which affects basil, brassicas, curcubits, lettuce, alliums, pea, potato, snake bean, ginger and tomato.

  • Infected leaves Gummy stem blight

    Information on Gummy stem blight, which affects cucurbits, particularly in tropical and subtropical areas. The disease can cause serious losses in watermelon, rockmelon, honeydew, squash, pumpkin and cucumber.

  • Infected leaves Lethal yellows

    Information on Lethal yellows, which affects strawberries.

  • Infected leaves Lettuce necrotic yellows

    Information on Lettuce nectrotic yellows, which can cause serious sporadic losses in lettuce crops.

  • Infected fruit Phytophthora fruit disease

    Information on Phytophthora fruit disease, which affects tomato, strawberry, onion, fig, durian and papaya.

  • Leaf fall at flowering Phytophthora root rot

    Information on Phytophthora root rot, which is the most destructive and important disease of avocado. It also affects macadamia, pineapple and stone fruit.

  • Affected potato tubers Potato brown fleck

    Information on Potato brown fleck, a disorder which affects potato.

  • Yellow-green blotches appear on vine leaves, progressing to powdery white on the leaf surface Powdery mildew

    Information on Powdery mildew, which is probably the most common of all plant diseases.

  • Affected tuber Rhizoctonia

    Information on rhizoctonia, which affects almost all cultivated plants.

  • Infected lettuce Sclerotinia rot

    Sclerotinia rot is a disease which affects a wide range of vegetable, fruit and field crops.

  • Infected onion bulb Sclerotium disease

    Information on Sclerotium disease, which affects a range of vegetable crops including bean, beetroot, capsicum, carrot, cucurbits, sweetpotao, potato and tomato.

  • Affected leaf and thrips Spotted wilt and related viruses

    Information on Spotted wilt and related virusesl, which affect over 900 species of weeds, field crops, vegetables and ornamentals.

  • Infected fruit Stem end rot

    Information on Stem end rot, which affects mango, avocado, citrus.

  • Infected plants Sudden wilt

    Sudden wilt affects capsicum, rockmelon and honeydew.

  • Sweetpotato plants with distorted leaves (left) and aphids hiding under leaves (right) Sweetpotato feathery mottle

    Information on Sweetpotato feathery mottle, which occurs in almost all countries where sweetpotato is grown.

  • tomato yellow leaf curl virus- Image 1 Tomato yellow leaf curl virus

    Information on tomato yellow leaf curl virus symptoms and damage, how it spreads and how to manage the virus.

  • Infected fruit Transit rot

    Transit rot disease affects mango, tomato, capsicum, rockmelon, stone fruit and sweetpotato.