Conserve Plus is the latest addition to the Conserve family. It is a novel formulation, combining Spinosad and S-methoprene at 100 gm ai per L. Conserve Plus can be used on all cereal grains, including malt barley and maize. The first release was a 500ml bottle that treats 50 T of grain. Conserve Plus requires a mixing partner to control rice weevil, and as such, Dow AgroSciences released a 1L Reldan Grain Protector to partner Conserve Plus. When used on malt barley or maize, the OP mixing partner is replaced with Fenitrothion 1000.
In quarter 3 2017, Dow AgroSciences will launch a 5L pack which will treat 500 T of grain. It is anticipated that a 10L Reldan Grain Protector will be released to partner this new pack size.
Grain Pests Controlled
- Conserve On-Farm is a grain protectant that has three active ingredients to control all major insect pests of stored grain, including the resistant lesser grain borer (LGB).
- Providing six to nine months of control and with a nil withholding period (WHP), Conserve On-Farm maximises grain marketing flexibility.
- Maximum residue limits (MRLs) have been established with key trading partners and there are no meat residue bioaccumulation issues.
Conserve On-Farm is a combination of two parts that are applied together. Using Part A and Part B together is very important to get control of the complete spectrum of insects.
Part A: 1 x 5 L of chlorpyrifos-methyl and S-methoprene – controls all stored grain insect pests other than the resistant lesser grain borer (Rhyzopertha dominica)
Part B: 2 x 1 L of spinosad – is very effective on the lesser grain borer, including resistant strains, but has little to no activity on other key species.
Controls resistant strains of lesser grain borer
Global and Australian trials have proven the effectiveness of spinosad in controlling lesser grain borer. Trials conducted using wheat treated in on-farm storages showed that spinosad at 1 ppm gave complete control out to 12 months (the longest period any of the trials ran for).
Summary across trials
Not only are adults controlled, but F1 progeny production is enormously reduced. As spinosad is active against adults out to 12 months without any drop in efficacy, any progeny at nine months will also be controlled.
The connection between low or marginal use rates and selection for resistance is well documented – and for that reason the 0.96 ppm spinosad rate has been chosen as the label use rate.
Nine months control of lesser grain borer
A study conducted by Dr Greg Daglish and Dr Manoj Nayak of Department of Agriculture, Fisheries and Forestry, Queensland, was undertaken to determine the persistence and efficacy of spinosad against LGB in wheat stored for nine months at 30ºC and 55% or 70% relative humidity. Wheat was treated with spinosad and sampled after 0, 1.5, 3, 4.5, 6, 7.5 and 9 months storage for bioassays and residue analyses.
The laboratory study showed that spinosad was completely effective against LGB for nine months, with 100% adult mortality and no live adults produced after 14 days of exposure in warm temperatures and high relative humidity, indicating that spinosad is an effective grain protectant in climates such as Australia.