TECHNOLOGY FOCUS - AGRICULTURE - Preferred components: The fibrous material is a plant stalk. The plant is a banana plant. Preferred method: The method includes pressing plant stalks to extract juice, adding a microbial solution to the extracted juice and allowing the juice to undergo fermentation, milling the pressed stalks, adding water and a microbial solution, allowing the stalks to undergo microbial digestion and filtering any solids from the solution, the filtrate being combined with the fermented solution.Preferred composition: The nematicidal agent is useful in nematicide compositions which include at least one plant essential oil selected from Eucalyptus polybractea,E. rad v. australiana/dives O, Eucalyptus radiata, Eucalyptus citriodora, Halichrysum italicum, Foeniculum vulgare v. dulc, Boswellia carterli, Ferula galbanilflua, Pelargonium roseum, Zinglber officinale, Citrus paradisi, Gualacum officinale, Jasminum officinale, Hlerochloe alpina, Juniperus communis, Lavandula hybrid, Lavandula officinalis/angustifolia, Lavandula spica, Citrus Ilmonum, Cymbopogon citratuss, Citrus medioa, Litsea cubeba, Citrus nobilis/dellciosa, Citrus aurantium dulce, Cymbopagan martini, Petroselinum crispum, Pogostermon patchouli, Piper negrum, Mientha piperita officinalis, Mientha piperita officinalis, Citrus aurantium, Pinus sylvesins, Rosa damascen, Rosmarinue officinalis, Aniba rosaedora, Salvia officinalis, Santalum album, Mentha sploata, Tagetes patula, Citrus reticulata, Terebinth, Thymus vulgaris, Polyanthes tuberosa, Andropogon muricatua, Viola Odorata, Cananga odorata genuina or Azadiredta indica Backhaudia Citriodora. A preferred composition includes essential oils of tea tree, eucalyptus and backausia citriodora. The composition comprises the nematicidal agent (about 5-30 vol.%) and essential oil (about 0.45-2.5 vol.%). The composition includes a wetting agent, preferably palm oil, coconut diethanolimide or a mixture of these. The composition includinga wetting agent comprises water (about 40-80 vol.%) and wetting agent (about 5-20 vol.%). The composition includes a nematode attractant, preferably molasses (about 2.5-10 vol.% of the composition). A further preferred composition comprises the nematicidal agent obtained from a banana plant and a solid carrier, preferably zeolite, onto which the agent is absorbed. ACTIVITY - Nematicidal.    To filtered H2O (60 l.) was added palm oil (10 l.) then coconut oil (1.5 l.) both with stirring. Urea (5 kg.) was dissolved in banana water (19 l.) and the solution was added to the water/oil mixture. Molasses (5 l.), tea tree oil (500 ml.), eucalyptus oil (2 l.) and backhausia citriodora (5 ml.) were added to the mixture to give a nematicidal composition. The composition was applied to an area of land fairway turf and Bent Greens turf at a rate of 2l./100 m.2. Two weeks after treatment the numbers of nematodes found were 0 Belonolamius sp, 0 Helicotylenchus sp, 1 Paratrechodorus sp and 0 Paratylenchus sp. Figures for an untreated area were 6, 156, 34 and 10 respectively.    MECHANISM OF ACTION - None given in source material.    EXAMPLE - Banana stalks were pressed and the extracted juice was treated with a microbial solution and brought to a fermenting stage over 14 days. The stalk waste was put through a hammer mill process and turned to mulch then put into a solution of equal parts water. A microbial solution was added to liquefy the mulch in a 20 day process. The solids were removed by filtration and the waters added by equal parts to the juice extracted from the banana stalk to give a nematicidal agent.