250 Redmond and Potter: Acelepryn Control of Horticultural Pests Figure 3. Residual control of bristly roseslug larvae and their feeding damage by sprayed field-weathered residues of chlorantraniliprole or carbaryl on rose foliage, compared to untreated checks (UTC). The pre-sprayed shoots were har- vested after their respective weathering intervals and chal- lenged with separate cohorts of similar-sized larvae all on the same day. Note the longer residual efficacy of chloran- traniliprole than carbaryl. Within residue ages, means not topped by the same letter are significantly different (ANOVA, LSD, P < 0.05). numbers of live settled oak lecanium scale crawl- ers, whereas bifenthrin gave about 96% control. Mean numbers of living settled crawlers (totals for five leaves per shoot) for untreated checks, chlorantraniliprole, and bifenthrin were 1093 ± 460, 1141 ± 811, and 49 ± 10, respectively (F2,6 = 28.7, P < 0.001 on log-transformed counts). Efficacy of Systemic Soil Applica- tions on Boxwood and Rose Pests Systemic applications targeting boxwood pests Chlorantraniliprole applied as a basal soil drench in the preceding autumn (October) or in spring (April) before leaf flush failed to pre- vent boxwood psyllid damage or to reduce in- Figure 4. Lack of efficacy of chlorantraniliprole (Chlor) foliar sprays for: A) residual control of hawthorn lace bugs, or B) curative control of oleander aphids on milkweed, in trials where the standard, bifenthrin (Bifen), was effective. Data are means (± SE) per replicate. UTC = untreated check. For lace bugs, F2,10 respectively, P < 0.001; for aphids, F2,21 Within trials, means topped by the same letter are not sig- nificantly different (LSD, P > 0.05). festations of boxwood leafminer (Table 3). Imidacloprid, the standard, gave 89% reduc- tion in psyllid damage from the October treat- ment, and 90% and 99% control of leafminers when applied in October or April, respectively. Basal drenches with chlorantraniliprole in April or May also failed to control boxwood leafminer infesting in-ground boxwoods at the wholesale nursery. Mean ± SE numbers of mined leaves (out of 30) on those shrubs, assessed in October, were 19 ± 3 and 15 ± 4 for the April and May chlorantraniliprole drenches, compared to 22 ± 1 for untreated shrubs (F2,8 = 1.3, P = 0.33). Both standards (dinotefu- ran and thiamethoxam) gave 100% control. = 244, 22.4 for 1- and 7-day-old residues, = 49.9, P < 0.001. ©2017 International Society of Arboriculture
November 2017
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