Broad-leaved Dock (Rumex obtusifolius)

Rust is a common fungal disease caused by fungi in the order Pucciniales that affects a wide variety of plants. The disease gets its name from the characteristic orange, yellow, or reddish-brown pustules that appear on leaves, resembling metal rust. This obligate fungal parasite requires living plants to survive and can cause significant economic losses in agricultural crops.

Ramularia is a fungal disease (leaf spot) that affects foliage. It begins as small, sharply defined spots, often light green or yellow, which turn brown or gray and may develop a pale border. A fine, grayish-white powdery layer of spores can be seen on the underside of the leaves. Leaves yellow and wither more rapidly during severe infestations. The disease thrives in cool, damp weather and spreads via water splashes, dense plant growth, and infected cuttings or seeds. In home gardens, it is particularly common on geraniums (Pelargonium) and beets/chard; in agriculture, it is well-known for affecting barley.

Leaf chewing damage is caused by various pests like caterpillars, beetles, and slugs that eat plant tissue. This physical damage reduces the plant ability to make food through photosynthesis and can leave the plant open to infections. If left alone, these pests can strip a plant of its leaves very quickly.

Curculionidae (weevils) are small beetles that feed on plants. Adults chew leaf margins, leaving crescent-shaped notches, primarily at night. The larvae live in the substrate and consume roots, causing decline, yellowing, and wilting even when the substrate is moist, and in severe cases, plant death. They frequently affect ornamentals and garden plants such as strawberries, citrus, roses, hydrangeas, azaleas, blueberries, begonias, and many potted plants.