Craw scale

Craw scale (Andaspis crawii) is a significant insect pest belonging to the order Hemiptera and the family Diaspididae. Known as an armored scale, this species poses a threat to various woody ornamental and fruit-bearing plants in tropical and subtropical regions.

The primary host range for this pest includes various species within the Myrtaceae and Oleaceae families. It is frequently observed on plants such as eucalyptus and olive trees, where the scale insects attach themselves to the bark, leaves, and young twigs to extract vital plant nutrients.

The biological cycle of Andaspis crawii is characterized by its protective shield, which makes the adult stage highly resistant to environmental stressors and chemical treatments. The cycle progresses from eggs to mobile crawlers, which are the primary dispersal stage, followed by sessile development.

Damage caused by this scale insect is systemic in nature. By piercing the plant tissue and feeding on phloem sap, the insects cause chlorosis, stunted development of foliage, and dieback of branches. Severe infestations can lead to a significant decline in plant health and, in extreme cases, plant mortality.

Management strategies for Craw scale involve an integrated pest management approach. Key practices include:

• Application of contact or systemic insecticides during the crawler emergence phase.
• Pruning and destruction of heavily infested plant parts.
• Maintaining strict phytosanitary surveillance on imported nursery stock.