• Cryptolaemus montrouzieri

  and feed on mealybug nymphs and adults. Pupal stage: Larvae pupate in various places, on any convenient stalk or on the underside of leaves or on even greenhouse [...] in clusters on plant foliage or near mealybug-infested areas. They are typically yellow-white in color and may be found attached to leaves. Larval stage: [...] control . Originating from Australia, this beetle species preys primarily on mealybugs , including species such as the citrus mealybug and the long-tailed

• Black leg of seedlings

  wounds, where the side roots are formed or through other similarly damaged spots. On the infected plant, new sporangia with zoospores are formed, that allow [...] low soil or water temperatures and causes among others cereal diseases. Damage symptoms Pythium affects roots, in particular those of seedlings. Infected [...] growth. Seedlings fall over (‘damping-off’). In slightly older plants, the leaves lose their turgor or the leaf tips turn yellow, for example in flower bulbs

• Whitefly – small pest, big problem

  February 2, 2023

  sooty mold will form on the honeydew, which growers want to avoid. It makes fruit unsaleable, and the sooty mold on the leaves will trigger reduced p [...] inflict severe damage in vegetable, fruit, and ornamental crops. To minimize the impact, it’s important to be able to recognize damage as quickly as possible [...] causing damage. This can include irregular ripening in tomatoes and peppers, yellowing of flower stems in gerbera, and severe yellowing of the leaves of green

• Rhizoctonia solani

  soil and on crop residues. It is also seed-borne. Thanatephorus cucumeris causes diseases such as phytophthora root rot and black leg. Damage symptoms [...] caused by Thanatephorus cucumeris depend on the time of infection. In general, the fungus causes symptoms on all plant parts that are in or close to the [...] grow upward. Lesions are brown and rot on fruits is brown, water-soaked and sunken. Late infection causes top leaves to curl up. The fruits stay firm. The

• Cotton leafworm

  Europe including the Balearic Islands, Madeira and the Azores. Damage symptoms Most of the damage is caused by the older caterpillars which are voracious leaf [...] excrement protrudes from the holes they have produced. On tobacco, the stem base is often destroyed. On maize, the cotton leafworm ( Spodoptera littoralis [...] whitish yellow. They are laid in clusters of 20 to 500 pieces on lower leaf surfaces, often on the lower parts of the plant. The female covers the eggs with

• Corn earworm

  aubergine, pepper, and tomato. They primarily feed on flowers and fruit from the host plant, as well as on the corn of immature cobs and ears. Adults of corn [...] development. Damage symptoms The female lays small quantities of eggs, between one and three, in the hairs of green ears of corn. The larvae feed on the hairs [...] feed again on the tip of the cob, making holes in the corn. In other crops, they prefer flower buds and soft fruit. They cause visible damage through feeding

• Bugs

  are found as pests in agricultural crops. Bug damage Phytophagous bugs damage plants by puncturing leaves and growing points with their piercing-sucking [...] Biological control of bugs Bugs can cause extensive damage to greenhouse and field crops by feeding on plant tissues and fruits, leading to deformation, [...] and puncture holes. The most obvious damage is the deformation of growing points. They also cause tissue damage and deformed growth as a result of toxic

• Grape downy mildew

  e, characteristic ‘oil spots’ on the upper surface of young, actively growing leaves, followed by downy white growth on the underside, are typical early [...] light-green oil 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 [...] viticola) relies on a preventive and integrated approach. Since the pathogen remains latent before symptoms emerge, control strategies should focus on reducing

• Botrytis problems often have company

  December 20, 2021

  crop is an ecosystem in which all living organisms interact. We capitalize on this system when using natural enemies. However, as a grower, you’ll also [...] another to strike. This applies to Botrytis , too. When this fungus grows on a wound, the plant defends itself by creating antibodies. Although plants [...] such as Duponchelia , are a good example of this. They cause substantial damage as they feed, creating the ideal access points for the fungus. Sciarid flies

• Black vine weevil

  It belongs to the family Curculionidae. Damage symptoms The major damage is caused by the feeding of the larvae on the roots. After the roots have been destroyed [...] resistant to damage than young plants or just planted cuttings. The adult beetles are only active at night, taking round bites out of the leaves, starting [...] stems of the plants. Both adult beetles and larvae are polyphagous and feed on a large number of plant species. High populations of larvae can destroy plants