• Tomato leaf miner

  one hour the larva crawls out of the leaf and falls to the ground. This occurs in the early morning. The larva crawls into the ground to pupate. A small [...] percentage of the larvae remain hanging on the leaf and pupate there, sometimes on the upper surface but more commonly on the underside. The late third instar [...] older larvae have a yellow head. When the larva hatches from the egg, it begins to eat into the leaf at once, tunnelling down into the mesophyll tissue

• Melon thrips

  are deposited in leaf tissue in a slit cut by female. Eggs are colourless to pale white in colour. The nymphs resemble the adults in general body form but [...] 8 to 1mm in length, with females slightly larger than males. Life cycle is completed in 20 days under favourable conditions. [...] General It is polyphagous pest and has been recorded more than 36 plants families. Damage symptoms Nymphs and adults are damaging stage. Infested leaves

• Leaf stripe

  during the cropping season. The fungus is seed-borne and this systemic infection is the only source of primary infection. The fungus spreads from the seed [...] formed at the base of the leaf and the leaf sheath. They gradually extend and become brown and chlorotic and may merge. Eventually this leads to the death [...] death of the leaf. The leaf splits at the end which makes it look shredded. This is typical for this disease. Infected plants may be stunted and heads may be

• Cotton aphid

  hormones. As a result, the plant’s growth is retarded giving rise to deformed leaves or, if the infestation occurs early enough in the season, the death of [...] and kalanchoe. The cotton aphid ( Aphis gossypii ) is distributed throughout the world but prefers the warmer regions. It has been a pest in European [...] transmit more than 50 different viruses, including the cucumber mosaic virus. Nymphs and adults extract nutrients from the plant and disturb the balance of

• Red palm weevil

  migrate to the periphery of the palms to build a solid elongated cocoon made of rolled-up palm fibres. After the cocoon is formed the larva enters a pre-pupal [...] morphology of the palms, direct or indirect destruction of the apical bud will lead to the death of the plant, which makes the red palm weevil ( Rhynchophorus [...] ) are typical weevils: the head extends with a long thin rostrum that holds the antennae and tiny mandibles. The size and colour of adult weevils greatly

• Broad mite

  their eggs mainly on the underside of the leaf or on the fruit surface. The elongated, oval eggs are firmly attached to the surface and are rather large [...] to the damage caused by viruses. The typical pattern of damage consists of malformation and distortion of the above-ground growth of the plant. The mites [...] mites show a preference for young, developing plant tissue, like the growing tips, young leaves and flower buds. The mechanism causing the deformation is

• Verticillium wilt

  vessels. The presence of both the fungus and the gum causes the xylem vessels to get blocked, which in turn causes the plant to wilt. Spores may be wind-dispersed [...] recover at night. The symptoms may occur only in parts of the plant. Cutting the stalk horizontally reveals a slight discolouration of the vessels, brown or [...] of the plant and produces spores that are transported upwards with the transpiration stream. As a defence mechanism, the plant produces gum in the vessels

• Spidex Vital lives up to its promises

  after the first deliveries were released, he had a closer look at the crop. ‘It was clear that the predatory mites were distributed throughout the crop [...] explain the added value of the new product to the market in very clear terms. Just like its predecessor more than fifty years ago, Spidex Vital has the full [...] into a game changer in spider mite control. It changes the rules of the game and is even more in control of spider mites . And the grower reaps the benefits

• Angular leaf spot

  or leaves in the soil, but not independantly in the soil. Under humid conditions, bacteria ooze from the lesions on the leaves and form a secondary source [...] underside of the leaf. They enlarge to angular spots, often limited by the small veins. The distinctive feature is the way the lesions look when using different [...] visible on the upper side of the leaf as irregular spots which are first reddish brown and then become necrotic. The foliar symptoms are the most important

• Tobacco aphid

  of dispersing through the crop by walking. The tobacco aphid tends to form denser colonies, closer to the top of the plant, than the peach potato aphid [...] from the plant and disturb the balance of growth hormones. As a result, the plant’s growth is retarded giving rise to deformed leaves or, if the infestation [...] have a brown-black head and thorax and a reddish abdomen. There is a dark brown spot on the abdomen and several transverse black bands across the body