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Silverleaf nightshade (Solanum elaeagnifolium) is a weed that reduces production in crop and pasture enterprises throughout the Australian wheat-sheep zone. It is a long-lived perennial plant with very deep, resilient roots. It grows during spring and summer and uses valuable moisture and nutrients needed for following crops and pastures. Crop yields can be reduced by 50 to 70% by dense infestations. Spread is relatively slow but, once established, it is extremely difficult to eradicate. Established dense infestations are an ongoing annual burden on productivity and costs, and there are no suitable effective herbicide treatments that will kill dense infestations quickly.