Agistemus fleschneri (Summers)Zetzellia mali (Ewing)
Agistemus fleschneri is the principal species found in QC and northern ON orchards, while Zetzellia mali predominates in the US, southern ON and the maritime provinces. Immature stages are bright yellow. Adult females of Agistemus are orange-red (A) and can be confused with the European red mite (Panonychus ulmi), but do not possess its silky white hairs. Zetzellia adults are bright yellow (B), but can appear reddish after feeding on red mites (C). Eggs are round and yellow (D). Note: In general, these mites are sensitive to broad-spectrum insecticides, but less so than phytoseiid mites.