DeFrancesco, J. T.

Fisher, Glenn C.

Undetermined

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Section VSoil ArthropodsCONTROL OF THE GREY GARDEN SLUG WITH BAITSJ.T. DeFrancesco and GC. FisherDepartment ofEntomologyOregon State University2046 Cordley HallCorvallis, OR 97331-2907541/737-0718defrancj@bcc.orst.eduTwo trials were established in commercial fields ofperennial ryegrass near Corvallis, Oregon, todetermine the effectiveness ofmolluscidal baits in controlling the gray garden slug {Derocerasreticulatum, Mueller). Bait treatments consisted ofMesurol (2% methiocarb) and DeadlineMini-pellets (4% metaldehyde).Field Trial #1:Treatments included Mesurol bait at three different rates: 5.0 lbs/Ac, 7.5 lbs/Ac and 10.0 lbs/Ac,and Deadline Mini-pellets at 10.0 lbs/Ac. Treatments were arranged in a randomized completeblock design with four replications; each plot measured 75 x 75 ft. Treatments were applied witha hand-held dispenser on 16 Dec 98 and 15 Jan 99. An untreated control was included forcomparison.Treatments were evaluated on 19 Dec 98, 27 Dec 98,12 Jan 99, 19 Jan 99 and 26 Jan 99. Slugpopulations were determined using open bait stations consisting ofthree metaldehyde bait pelletsper station, with five bait stations within each treatment in each replicate. Number of slugsvisiting each bait station was recorded 24 hours after each baiting episode. Due to unfavorableweather conditions (very wet or freezing temperatures) reliable slug population data could becollected only on 12 Jan 99 and 26 Jan 99, which corresponds to 27 days after first treatment and11 days after second treatment, respectively.Results ofField Trial #1:At 27 days after initial treatment application, all molluscide treatments had statisticallysignificant fewer slugs when compared to the untreated control (Table 1). All rates ofMesurolBait provided a comparable amount ofcontrol. A similar trend occurred on 26 Jan 99, 11 daysafter the second application ofthe molluscide treatments.Table 1. Effect ofbaits and rates on slugmortality,Field Trial #1, perennial ryegrass, Corvallis,1999.Treatment1/12/99 (27 DAT) 1/26/99No. slugs % Control No. slugs01 DAT)% ControlMesurol @ 5 lbs/AcMesurol @ 7.5 lbs/AcMesurol @ 10 lbs/AcDeadline Mini-pellets @ 10 lbs/AcUntreated Control10.4 a * 63.4 2.8 a *11.8 a 58.4 4.0 a9.1a 68.0 3.9 a14.1a 50.4 5.6 a28.4 b --- 17.2 b83.776.777.367.4* Means followed by the sameField Trial #2:letter within a column do not differ significantly at P < 0.05Treatments included Mesurol bait at 10.0 lbs/Ac and Deadline Mini-pellets at 10.0 lbs/Ac.Treatments were arranged in a randomized complete block designwith four replications; eachplot measured 100 x 100 ft. Treatmentswere applied with a hand-helddispenser on 17Dec 98.An untreated control was included for comparison.Treatments were evaluated on 19Dec 98, 27 Dec 98,12 Jan 99, 19 Jan 99 and 26 Jan 99. Slugpopulations were determined using open bait stations consisting ofthree metaldehyde bait pelletsper station, with five bait stations within each treatment in each replicate. Number of slugsvisiting each bait station was recorded 24 hours after each baiting episode. Due to unfavorableweather conditions (very wet or freezing temperatures) reliable slug population data could becollected only on 12 Jan 99 and 26 Jan 99, which corresponds to 26 and 40 days after treatment,respectively.Results ofField Trial #2:At 26 days after initial treatment application, both Mesurol and Deadline Mini-pellet plots hadstatistically significant fewer slugs when compared to the untreated control (Table 2). At 40days after treatment, only the Mesurol-treated plots had statistically significant fewer slugs thanthe untreated control.Table 2. Effect ofbaits on slug mortality, Field Trial #2, perennial ryegrass, Corvallis, 1999.1/12/99 (26 DAT) 1/26/99 (40 DAT)Treatment No. slugs % Control No. slugs % ControlMesurol @ 10 lbs/Ac 0.8 a 99.3 0.9 a 80.4Deadline Mini-pellets @ 10 lbs/Ac 2.3 a 80.5 2.7 ab 41.3Untreated Control 11.8b 4.6 b —Means followed by the same letter within a column do not differ significantly at P < 0.0582

Control of the grey garden slug with baits

https://ir.library.oregonstate.edu/downloads/4x51hr13v

Control of the grey garden slug with baits

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