and purple scale (Lepidosaphes beckii Newm.). The outbreak of scales is associated with mild climatic conditions, especially high relative humidity in the air and. Lepidosaphes beckii (Newman) (Hemiptera: Diaspididae) seasonal abundance on sour-orange, Citrus aurantium trees was carried out in Kafr El-Sohaby, at. The ecology of the purple scale Lepidosaphes beckii (Newman) (Hemiptera: Diaspididae) was studied on citrus, in the area of Kalamata.
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UC IPM: UC Management Guidelines for Purple Scale on Citrus
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Scale infestation can be seen by the appearance of the purplish brown scale armour on stems, leaves and fruits of host plants. Nymphs and adults suck sap from the foliage and branches and spread to the fruits, causing disfiguration, which decreases market value.
How to Manage Pests
Symptoms are generally related to the severity of attack population density on host. Damage to fruit occurs in heavy infestations, where spotting and often deformity of fruits affects market value.
Areas surrounding scales remain green long after the rest of the fruit ripens. The areas surrounding the scale insects on leaves turn yellow and when severely infested the entire leaf may be discoloured prematurely.
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Heavy infestation can also lead to leaf fall and leaf and shoot malformation; and in extreme cases, host death. Cultural Control Dispersal from plant to plant occurs through the activity of crawlers at points where adjacent plants touch.
Thus, spread of infected material can be reduced by pruning and allowing adequate spacing between plants throughout cultivation. Mechanical control can be achieved by scraping and scrubbing to remove scales. These predator and parasite populations can be disturbed by the use of broad-spectrum insecticides.
Insect Growth Regulators used in the control of scales have been shown to disrupt the fecundity and egg viability of Chilocorus sp. Hattingh and Tate, Lepidosahpes lepidosaphes is particularly successful at L. Between andA. It is also reported to play a major role in controlling L.
Lepidosaphes beckii – Wikipedia
Partial control of L. Aphytis melinus, which has been used in the widespread control of the red scale Aonidiella aurantiialso attacks L. Hare and Morgan report on the mass-priming of Aphytis sp. Aphytis holoxanthus and Aphytis chrysomphali also attack L.
Spread of these parasites has occurred as a result of introduction to control the Florida red scale Chrysomphalus aonidumand through accidental spread with its hosts. Chemical control, where necessary, is usually achieved by spraying with mineral oils at critical points during the season.
Mixtures of mineral heckii and insecticide e. They concluded that treatment should be begun as soon as scales are detected, even in small numbers. However, such combinations are highly detrimental to natural enemies, possess high mammalian toxicity and should be avoided except in extreme emergencies. Armourd scales on citrus.