--- title: Wilt canonical: https://fernland.com.au/problem-solver/wilt/ dateModified: 2026-08-07 09:34:39 summary: "Fusarium and Verticillium wilts are soil-borne fungal diseases that block plant vascular tissue, causing wilting, yellowing and dieback." type: article keywords: [Wilt, "Fusarium & Verticillium spp."] --- # Wilt > Fusarium and Verticillium wilts are soil-borne fungal diseases that block plant vascular tissue, causing wilting, yellowing and dieback. *Fusarium & Verticillium spp.* Wilt diseases in nursery, turf and landscape situations are most commonly caused by soil-borne fungi in the genera *Fusarium* and *Verticillium*. These pathogens colonise the water-conducting (xylem) tissue of roots, crowns and stems, restricting water movement through the plant. The result is wilting and collapse that can resemble drought stress even when soil moisture is adequate. On cut stems or crowns, infected vascular tissue often shows a brown, grey or reddish-brown discolouration running lengthwise, visible when the stem is sliced open. *Fusarium* species may produce fine white to pink cottony mycelium at the base of affected plants or on decaying tissue in humid conditions, sometimes with visible spore masses. *Verticillium* typically produces less obvious surface growth, with disease more evident as internal streaking. Both fungi persist in soil and plant debris as resilient resting structures (chlamydospores or microsclerotia) that can survive for years, making them difficult to eradicate once established in a growing area or garden bed. These pathogens are widespread across Australian production nurseries, turf facilities, cut flower crops, vegetable operations and landscape plantings, affecting a broad range of woody and herbaceous hosts. Disease development is favoured by warm to mild soil temperatures, waterlogged or poorly drained media, plant stress, and root damage from handling, nematodes or transplanting, all of which give the pathogen easier entry and reduce the plant's ability to resist infection. Management relies on prevention rather than cure, since infected plants cannot usually be salvaged. Key measures include sourcing disease-free planting material, using pathogen-free growing media and clean pots, avoiding waterlogging and overwatering, ensuring good drainage, sanitising tools and equipment between batches, removing and destroying infected plants and debris promptly, and practising crop rotation with non-susceptible species where wilt has occurred previously. Reducing root stress from nematodes, mechanical damage or nutrient extremes also lowers infection risk. ## How to identify - **Wilting foliage** that does not recover with irrigation, often starting on one side of the plant or on lower/older leaves first. - **Yellowing (chlorosis)** and leaf browning progressing up the plant, sometimes affecting only one branch or stem initially. - **Stunted growth** and general lack of vigour compared to unaffected plants nearby. - **Vascular discolouration** — cut a wilting stem or crown lengthwise near the base; a brown, grey or reddish streak in the internal tissue confirms vascular infection. - **Crown or root rot** with soft, discoloured tissue at the soil line, sometimes with fine white or pink fungal growth in humid conditions. - **Sudden collapse** of turf patches or nursery stock, particularly under heat or moisture stress, in irregular patches rather than a uniform pattern.To confirm, dig up a symptomatic plant and inspect the roots and crown for rot or discolouration, and check the vascular streaking described above. Because symptoms overlap with drought stress, root rots caused by *Phytophthora* or *Pythium*, and simple waterlogging, laboratory diagnosis is often needed for positive identification, especially where valuable crops or large areas are affected. A key difference from drought stress is that wilt symptoms persist or worsen despite adequate soil moisture, and vascular streaking is absent in plants suffering purely from water stress. ## Registered products we stock - [Banrot 400WP Fungicide](https://fernland.com.au/banrot-400wp-fungicide/) — ICL - [Stellar 250SC Fungicide](https://fernland.com.au/stellar-250sc-fungicide/) — PCT SureFire - [Chief 625 Topflo Systemic Fungicide](https://fernland.com.au/chief-625-topflo-systemic-fungicide/) — Adama - [Proplant Systemic Fungicide](https://fernland.com.au/proplant-systemic-fungicide/) — Colin Campbell Chemicals - [Switch Fungicide](https://fernland.com.au/switch-fungicide/) — Syngenta - [Azoxystrobin 250SC Fungicide](https://fernland.com.au/azoxystrobin-250sc-fungicide/) — EnviroMax - [Liquid Thiram Fungicide](https://fernland.com.au/liquid-thiram-fungicide/) — Amgrow Specialty Agriculture - [Headway Maxx Turf Fungicide](https://fernland.com.au/headway-maxx-turf-fungicide/) — Syngenta - [Banrot 80G Fungicide](https://fernland.com.au/banrot-80g-fungicide/) — ICL - [Interface Stressgard | Turf Fungicide](https://fernland.com.au/interface-stressgard-turf-fungicide/) — Envu - [Lexicon Intrinsic | Fungicide](https://fernland.com.au/lexicon-intrinsic-fungicide/) — BASF ## Image credits - [Photo: Schlaghecken Josef via Wikimedia Commons (CC BY-SA 4.0)](https://commons.wikimedia.org/wiki/File:Basilikum_Fusarium-Schlaghecken.jpg) - [Photo: Howard F. Schwartz, Colorado State University, Bugwood.org via Wikimedia Commons (CC BY 3.0 us)](https://commons.wikimedia.org/wiki/File:Verticillium_wilt_dahliae.jpg) - [Photo: Lindsey D. Thiessen, Jason E. Woodward via Wikimedia Commons (CC BY 4.0)](https://commons.wikimedia.org/wiki/File:Patches-of-wilted-plants-affected-by-Verticillium-dahliae.jpg)