Citrus Rust Mite Control (CRM), 1982

Treatments were replicated 5 times on single-tree plots in both tests. Treatment trees were often directly adjacent in test 1 due to limited number of trees with sufficient fruit. In test 2, an unsprayed buffer tree separated treatment trees within and between rows. Sprays were applied dilute with a hand-gun at 200 psi on May 25-26 and at 250 psi on Jun 21-22 using a John Bean PC0200 sprayer (test 1) and at 250 psi on Jun 29 in test 2; ca 3 gal/tree was applied at each application in both tests. Water pH was 7.6 (test 1) and 7.0 (test 2). Triton B surfactant was added to the Gulf orchard spray at the rate of 1 oz/gal in test 2 only. The remaining oil formulations already contained surfactant. Twenty fruit were examined at random around the canopy of each sample tcee at various times before and after spraying. A 1 cm area was examined on each of 2 shaded sides per fruit. The combined 2 cm count per fruit of living motile CRM was recorded as 1 observation.