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As the fungus disease progresses , the insect disappears as the mycelium expands over its body . A cycle of negative feedbacks is common in gardens : disturbance damages the fungal partners of plants , making them less able to absorb nutrients , so the gardener adds a chemical ‘ fix ’ of inorganic fertiliser , which is toxic to the fungi , making them even less able to supply the plant . Additionally , a chemical spray solution of 10 % household bleach and water will kill the fungi . These plants are very strange , with morphologies so modified and reduced that botanists in the 19th century classified them among the fungi ! Phytopthora , Rhizoctonia , Fusarium , Sclerotium , and Sclerotinia are among the fungi discussed . The residue-head scab connection is , in fact , based on a biological reality that the head scab fungus , Fusarium graminearum ( telemorph : Gibberella zea ) , affects both corn and wheat and that the fungus survives in corn residue . The disease was first reported in the UK in the mid-90s and was widespread in 1998 , but in New Zealand it was first reported in 1998 , suggesting that the fungus was subsequently introduced there . If the branch dies before the fungus reaches the trunk , the fungus also dies . Furthermore , the fungus is not self-regulating in respect to any of them . The hyphae help the plant absorb water and nutrients and in return the fungi receive energy in the form of sugars , which the plant produces in its leaves and sends down to the roots .