ageratum houstonianum common name

Commonly killing the host. causing the plant to become stunted, the leaves wilt and turn yellow. Average Lowest Temperature : -1º C 30º F. This USDA hardiness zone chart can be used to to indicate a plant’s ability to withstand average minimum temperatures. Cultural practice such as minimal thatch build-up, regular aeration and a reduction of organic matter spread on the turf will reduce infection. Today, it is widely used as an ornamental plant for summer borders and balcony boxes, high varieties also as cut flowers. These are normally distributed by animals with barbs formed by the pappus and some by wind. ). Cyclamen species are attacked by the aphid (Myzus circumflexus) and (Aphis gossypii) which can infest healthy plants. When harvesting the tubers choose a dryer period and be careful not to damage them. These flowers are unisexual. Crocus, Iris, Tulipa, and Narcissus species are infected Copper Web ((Rhizoctonia crocorum). White Pine Blister Rust (WPBR) is caused by the fungus (Cronartium ribicola). As a common agricultural weed, it is managed in small and large cropping situation by tillage and can contribute to soil fertility as a waste mulch. normally is a rot that occurs in cuttings turning the stem progressively black and shrunken. This normally occurs in wet soils and is detrimental to the plants life. These temperatures represent the lowest average. The infected area develops minute black fruiting bodies. Tulipa species are affected Blue Mold (Penicillium species) and the fungus (Rhizopus stolonifer) causing rot in the bulbs. The species is cultivated once a year, having numerous varieties whose crowns may be dark blue, purple, pink and white. There are several other fungi including (Cladosporium species) and (Lophodermium laricis) cause leaf blight or leaf casts. The leaves do not have stipules and may be arranged opposite or alternate with margins that are entire to deeply lobed. It is a very common weed of farmland in Kenyan highlands, and is also a weed of other cropping systems in Kenya. It is native to Mexico and Central America. Callistephus and Solidago species may be infected by the Rust (Coleosporium solidaginis) which forms bright yellow spots particularly on new foliage or young plants. Their habitat is pastures, moist forest clearings and bushes up to altitudes of 1000 meters. The host tree changes to. Ribes species are infected by the rust (Cronartium ribicola). Tsuga species are infected by Sapwood Rot or Butt Rot (Ganoderma lucidum) and (Coniophora puteana), which attacks the sapwood close to the bark, towards the base of the tree. Apart from any fair dealing for the purpose of private study, research, reference or review, as permitted under the Copyright Act, no part may be reproduced by any means with out written permission. Tulip Bulb Aphid (Anuraphis tulipae) is small, waxy grey coloured and infests the underside of the bulb scales or rhizomes. Annual. The seed must have no dormancy-inducing physiological, physical or chemical barrier to germination; also the seed must be nondormant. species, new growth and leaves become infested with the aphid (, species are attacked by several types of aphid including the. Artemisia species are infected by the rust (Uromyces ari-triphylli) which is a systemic disease that is transmitted through seeds. They are used in the horticulture industry largely for cut flowers and in the case of sunflowers for seed oil. Prompt deadheading of the faded flowers is not necessary, but keeps a planting tidy and tends to promote a better uninterrupted bloom. Trillium species are infected by the stem rot (Pellicularia rolfsii) and ( Ciborinia trillii). The Ageratum houstonianum or Floss Flower as it is more commonly known, belongs to the Asteraceae family - the same very special family to which the Daisies, Asters, Gerberas, Chrysanthemums and so many others all belong. Numbers build up quickly in the warmer months of the year. Runners from the surrounding healthy turf will help with recovery and all signs of the problem disappear by mid summer. ) Forsythia species are infected by Stem Gall (Phomopsis species). affecting the lower stems and is not commonly seen. ) Ageratum houstonianum Mill. This is particularly important as it is softening the seed coat. an involucre). Species that live under ground are difficult to control but cultivation of the surrounding soil may help in controlling the infestation. ", Global Compendium of Weeds, Ageratum houstonianum (Asteraceae), Project Gutenberg Literary Archive Foundation,, Creative Commons Attribution-ShareAlike License, This page was last edited on 3 September 2020, at 09:50. Blue billygoat weed (Ageratum houstonianum) is also considered to be among the most invasive species in southern Africa, and is thought to pose a threat to the biodiversity of this region.

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