Abstract
Abstract Dilute sprays were applied with a hand sprayer (450 psi) at pink (4 May), petal fall (27 May), and as cover sprays on 14 and 28 Jun, 13 and 27 Jul, 8 and 22 Aug. Treatments were replicated three times (two six-tree plots and one eight-tree plot) in a RCBD. At harvest (30 Aug-5 Sep), 100 ‘Mcintosh’ and 100 ‘Cortland’ apples per replication were scored for insect damage. ERM and predaceous mites were sampled on 25 randomly selected ‘Mcintosh’ leaves/replication on 5 Jul, 1 and 16 Aug. On 29 Jul (48 h posttreatment) aphids were counted on the third and fourth distal leaves on five terminals per tree on a ‘Mcintosh’ and ‘Cortland’ tree in each replication. WALH were counted on 50 spur leaves (‘Rhode Island Greening’, Rep I and II, and ‘Mcintosh’ trees, Rep III) on 31 Aug. First generation STLM tissue mines were counted on 25 ‘Mcintosh’ terminals or non-fruiting clusters per tree per replication on 6 Jul. Second generation STLM tissue mines were counted on the six distal leaves on 20 randomly selected “hardened off’ ‘Mcintosh’ terminals per replication on 29 Aug.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have