He is widely recognized as a world expert on scale insect identification and management.
The timing of the latter spray will depend on the specific scale insect and geographic location of the trees.
The scale insect has been under eradication in the county.
Trees of the citrus species, which are attacked by scale insect, are usually the ones fumigated.
British Dictionary definitions for scale insect
any small homopterous insect of the family Coccidae and related families, which typically live and feed on plants and secrete a protective scale around themselves. Many species, such as the San Jose scale, are important pests