Impacts of foliar applied miticides on twospotted spider mites in peanuts, 2023

On 28 Sept 2023, research on the impacts of foliar miticides on twospotted spider mites was conducted at the Delta Research and Extension Center in Stoneville, Mississippi, to evaluate 3 miticides compared to an untreated check. Field studies were implemented as a randomized complete block with 4 replications. All plots received applications with a MUDMASTER, 4WD Multi-Purpose Sprayer (Bowman manufacturing, Newport, Arkansas) equipped with a compressed-air high-clearance mounted multi-boom calibrated to deliver 10 gallons per acre at 50 PSI using TX-6 Hollow Cone nozzles (2 nozzles per row) (TeeJet Technologies, Glendale, Illinois). All miticide treatments were mixed with 0.25% v/v nonionic surfactant. Twospotted spider mites were sampled at 4 and 7 days after treatment (DAT) by pulling 10 peanut leaves per plot and counting all mites, both adult and immature, on the underside of each leaf. Adult and immature mites held equal weight, and leaves from each plot were averaged together for analysis. Data were analyzed using ANOVA, and means were separated using Fishers protected LSD (P ≤ 0.05).

At 4 DAT, Portal had the lowest number of mites while being similar to both rates of Plinazolin Technology. All treatments had lower mite totals than the untreated check at this sample date. At 7 DAT, Portal and Plinazolin at 1.03 fl oz had the lowest mite totals but were similar to both Comite II and Plinazolin Technology at 0.684 fl oz. All treatments had lower mite totals than the untreated check at this sample date (Table 1).¹

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