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Apple tree branch with green leaves affected by a fungal disease rust. A branch of a rusted apple tree. Pest control and protection of gardens from diseases.

Aesculus hippocastanum (horse chestnut) leaves

A grape leaf showing the galls that are formed during a phylloxera infestation, is a pest of commercial grapevines worldwide.

The Valley Oak, can sometimes be riddled with large growths along the stem. Small wasps produce these oak apples or galls. The large oak apples, are induced by the gallwasp Andricus californicus. Shollenberger Park; Petaluma Wetlands; Petaluma; Sonoma County; California. Quercus lobata.

Apple tree branch with green leaves affected by a fungal disease rust. Deficiency or excess of elements and microelements of plant nutrition, disease. Rust spots of fungal disease on an apple tree.

Close-up of a magnolia fruit on branches in green leaves. High quality photo

Rust caused by Puccinia komarovii on green leaf of Impatiens parviflora (Small balsam)

Close up chestnut tree leaves, damaged by leaf- mining moth - horse-chestnut leaf miner (Cameraria ohridella)

Cork Oak (Quercus suber) tree. Luogosanto. Province of Sassari. Sardinia. Italy.

$Galls on white snakeroot (Ageratina altissima) in late summer. They look like a natural part of this wildflower, such as fruits, but inside a tiny insect called a stem gall midge is developing. This midge, Schizomyia eupatoriflorae, specializes in parasitizing this plant, which is poisonous.\n\nAccording to Wikipedia, Abe Lincoln's mom may have died from milk sickness passed on by cattle that ate white snakeroot, which is native to eastern and central North America. Bees and other pollinators love it. Photo taken in Connecticut.$

Close-up of immature hazelnuts (Corylus avellana) on their branch in the countryside. Drôme, France.

Leaf mines on horse chestnut leaf. Damage caused by horse chestnut leaf miner (Cameraria ohridella). Leaf in backlit showing details

oak apple gall from an Oregon Oak that was induced by the California gallfly Andricus californicus, Andricus quercuscalifornicus.

A close-up background of Kawakawa (Piper excelsum) in green tones.

$Close-up Ripening almond (Prunus dulcis) fruit growing in clusters in trees on a central California orchard.\n\nTaken in the San Joaquin Valley, California, USA.$

close up Fagus Sylvatica in the Lessini Mountains Regional Park near Campofontana, Verona, Veneto, Italy

leaf of a lime tree with bit marks from insects

Large maple leaves showing signs of the coming of fall

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