GRDC Grains Research Update Naracoorte 2018
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Presented at
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Insecticide resistance issues continue to outpace novel control options. • Redlegged earth mite (RLEM): o Resistance in RLEM has been detected for the first time in eastern Australia. o Synthetic pyrethroids (SPs) are completely ineffective against SP-resistant RLEM populations, while some efficacy remains for organophosphates (OPs) against OP-res...
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In 2017, blackleg leaf infection and resultant crown canker severity was low due to dry conditions in May and June during early seedling growth. Susceptible cultivars still had some level of disease but were well protected by fungicides applied at sowing which were highly effective due to the lower disease pressure. Application of foliar fungicides...
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Under-fertilising appears to be a major cause of yield gaps in cropping systems in the high rainfall zone (HRZ). Yield gaps need to take into account seasonal risk and relative crop and fertiliser prices. Soil test critical values should be higher than commonly used because of the higher yield potential of the HRZ....
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Glyphosate resistance has been detected in annual ryegrass and sowthistle. Initial trials suggest significant differences in efficacy between glyphosate products. Treating younger plants at lower temperatures can improve glyphosate efficacy on resistant biotypes. Crop topping with glyphosate is not effective on glyphosate resistant ryegrass....
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Annual ryegrass has evolved resistance to most post-emergent herbicides in the high rainfall zone (HRZ). Individual pre-emergent herbicides tend to have variable efficacy making mixtures and sequences better. Crops mature later in the HRZ meaning that more than 50% of the annual ryegrass seed can shed prior to harvest. This makes harvest weed seed ...
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Grass fodders will generally grow more dry matter in a year than legumes and in the vegetative stage their feed quality is equivalent to legumes. Most common are the annual legume fodders (balansa, arrowleaf and persian clover) and they can produce significant amounts of high quality fodder under favourable growing conditions. Perennial fodders, es...
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