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3 mm long. They quickly attach themselves to the plant and form a scale. Colonies mainly form on the underside of leaves. After 1 to 2 months, the…
o aphid Aphids have a complex life cycle, with both winged and wingless forms of adults and a great variety in colour. In greenhouses, reproduction…
shallot aphid Aphids have a complex life cycle, with both winged and wingless forms of adults and a great variety in colour. In greenhouses,…
Under humid conditions, bacteria ooze from the lesions on the leaves and form a secondary source of infection. They are dispersed by rain, irrigation…
become visible after five to seven days. On the lesions, new pycnidia are formed. The conidia that are produced in these pycnidia emerge in a pink…
third nymphal instar onwards are covered with a white waxy material in the form of powder, threads, spiky projections or platelets. Eggs are laid in a…
bean aphid Aphids have a complex life cycle, with both winged and wingless forms of adults and a great variety in colour. In greenhouses, reproduction…
disinfection needs to be applied thoroughly and evenly. Phomopsis sclerotioides forms sclerotia which can survive adverse conditions for years in the…
pairs of prolegs; one pair of prolegs protrudes from the posterior end, forming a distinctive 'V' shape. Throughout their development, larvae remain…
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