• Powdery mildew

  are fairly similar in all plant-pathogen combinations. The symptoms are white fluffy colonies, first and foremost on the upper side of the leaf. In severe [...] appear first and foremost on the upper side of the leaves. In most crops, the white colonies later turn brown or grey. Severely affected leaves may turn yellow

• Pear

  perennial, deciduous tree and cultivated for its fruit. The tree grows small, white flowers (about 2.5 cm or 1 inch in diameter) and produces a pyriform, fleshy

• Gerbera

  cultivars that differ greatly in size, shape and colour. The main colours are white, yellow, orange, red and pink, but one flower can have petals in varying

• Chrysanthemum

  flowering plant. Nowadays, a wide range of other colours is available such as white, purple and red.

• Grape downy mildew

  on the upper surface of young, actively growing leaves, followed by downy white growth on the underside, are typical early symptoms. Because visible symptoms [...] spots on the upper leaf surface, often angular and limited by leaf veins White to greyish downy growth on the underside of leaves under humid conditions

• Green peach aphid

  they shed white skin, betraying their presence in the crop. Wingless green peach aphids (Myzus persicae subsp. persicae ) may be green, white-green, light

• Potato

  fruiting and the development of the potatoes. The plant’s flowers vary from white, pink, red or blue, to purple and have yellow stamens. After the flowering

• Apple

  protected by a layer of epicuticular wax. Apples usually have a yellowish-white coloured exocarp. Sometimes their flesh is also pink or yellow.

• Mushroom

  environments. Several varieties of A. bisporus are grown commercially, including whites, crimini, and portobello. Many other mushroom varieties are also commercially

• Green potted plants

  plant and usually sold as houseplant. The leaves of the Dieffenbachia have white spots and specks and turn the plant into a decorative indoor object. The