Oxford Academic | Robert Van Steenwyk, Dani Lightle, Christian Cabuslay, Jaimie Choi | Arthropod Management Tests, Volume 43, Issue 1, 1 January 2018 | Link

This study evaluated the efficacy of organic and conventional insecticides for OLFF control. The study was conducted in a commercial ‘Sevillano’ olive grove near Corning, CA. Five treatments were replicated four times in an RCB design. Each replicate was nine trees, with the center tree as the sample tree. The orchard was planted on a 20-ft row × 20-ft tree spacing. Treatment timings were determined by weekly monitoring for adult OLFF from 5 Jun to 12 Sep with a McPhail trap placed in the center of each replicate. Traps were baited with Torula yeast that was changed on a weekly basis. Treatments were sprayed 1 wk after pit hardening with flies present on the traps on 28–29 Jun and again 1 mo before harvest as the fly population resurged on 23–24 Aug. Materials were applied with a hand-held orchard sprayer operating at 250 psi with a finished spray volume of 150 gal/acre. Approximately 1,500 fruits per replicate were inspected for OLFF presence, absence, and total damage shortly before commercial harvest.

OLFF data were analyzed using ANOVA and means were separated with Fisher’s protected LSD (P < 0.05) (Table 1).

Table 1.
Treatment/ formulationa Rate-amt form/ acre Percent OLFF-infested olives
Assail 30SG 8.0 oz 7.6 ab
Sivanto 200 SL 14.0 fl oz 4.8 bc
Venerate XC 128.0 fl oz 3.0 c
Danitol 16.0 fl oz 5.5 bc
Untreated check 10.3 a

Means followed by the same letter within a column are not significantly different (Fisher’s protected LSD, P < 0.05).

aTreatments included molasses at 5.0% v/v.

Assail was not significantly different from the untreated check. All other experimental treatments were significantly lower than the untreated check. OLFF infestation was significantly lower in the Venerate treatment when compared with Assail but Venerate did not differ from Danitol and Sivanto. Potential phytotoxic reaction to the molasses feeding stimulant was observed.

This research was supported by the California Olive Commission and by industry gifts of pesticides and research funding.