GRDC Grain storage specialist Chris Warrick explains how long to leave phosphine in large grain silos. What does ‘surface only application’ mean on the phosphine label?
GRDC Grain storage specialist Chris Warrick explains a key feature of fumigation recirculation systems in grain silos.
GRDC Grain storage specialist Chris Warrick demonstrates why a pressure test before every fumigation is worth while. Silos may be pressure tested on delivery or installation but ensuring they are actually sealed before fumigation can save time and ensure a successful result.
Download pdf Recent reports indicate an increasing number of trucks are being rejected at delivery for excess phosphine. The rejections fall into one of two
Download the Kondinin Group Research Report on Grain Silos 2022
Resistance monitoring of key insect pests has shown that combined grain protectants are a valuable integrated pest management tool for stored grain.
Up to 30 per cent of freshly harvested grain is treated with contact insecticides – or grain protectants – before being placed into storage.
Key points
– Cowpea weevils – or bruchids – are an important insect pest in stored pulse crops in tropical and subtropical Australia
They can be effectively controlled using label rates of phosphine fumigant in sealed silos over a minimum period of seven days
– No major differences in tolerance to phosphine were identified in 15 populations collected from multiple Queensland locations
Key points
– Rotating phosphine fumigation with sulfuryl fluoride will protect against the development of phosphine resistance
– Sulfuryl fluoride can only be purchased and applied by licensed fumigators
Key points
– A new study is investigating the impact of high temperatures and high moisture content on lentil storage to help growers protect grain quality
– Important quality traits such as seed coat colour (redness), germination efficiency and cooking quality were adversely affected by inappropriate storage conditions in as little as four months
Key points
– Strong resistance to phosphine in rusty grain beetle has increased substantially since the first resistant population was discovered in 2007
– The rusty grain beetle is mobile and resistant populations are present across the full spectrum of the grain supply chain
– Area-wide integrated pest and resistance management has the potential to suppress this problematic species indefinitely