Red scale

Systematic position of the pest Selenaspidus rubidus belongs to the order Hemiptera, family Diaspididae. This species is a specialized pest that poses a significant threat to evergreen trees and shrub crops, particularly in tropical and subtropical climatic conditions across the globe.

The list of host plants primarily includes citrus crops (lemons, oranges, mandarins), as well as various ornamental and forest species. The pest prefers to settle on leaves, young shoots, and fruits, which leads to a decrease in the commercial quality of the yield and a general decline in the tree's health.

Biology and life cycle of the scale insect are characterized by the presence of a protective shield, under which the insect body is hidden. Females are immobile, while the first-instar larvae, known as crawlers, are capable of moving actively across the plant to find the most suitable feeding sites. Depending on regional temperatures, the species can produce multiple generations per year.

Damage and economic impact result from the insect sucking plant sap from the tissues. This causes yellowing of the leaves, premature leaf drop, shoot deformation, and overall stunting of tree growth. When population density is high, fruits lose their marketability, becoming covered in unsightly spots and crusts.

Control measures involve a combination of agrotechnical and chemical practices. It is crucial to ensure proper canopy pruning for better penetration of spray materials. The use of systemic insecticides during the crawler emergence period is effective, as well as the application of horticultural oils, which block the breathing pores of the insects beneath the scale.

• Spatial isolation of infested plantings.
• Regular monitoring of foliage health.
• Utilization of natural enemies for biological control.
• Prompt sanitary pruning and disposal of affected plant parts.