![]() ![]() Leaf-eating flies, such as Hydrellia pakistanae, attack the weed by feeding on it as larva.(NIWA, 2003). The tuber-feeding weevil ( Bagous affinis) only attacks the tuber when the plant is not submerged beneath the water. Tuber-feeding weevils and leaf-eating flies are still under evaluation for their effectiveness. Chinese grass carp have been found effective, but these fish are vegetative generalists, so they should be used with care so as not to destroy native aquatic vegetation. \r\n Biological: Biological controls include Chinese grass carp ( Ctenopharyngodon idella), tuber-feeding weevils, and leaf-eating flies. Some of the herbicides which have been used are Fluridone and endothall (dipotassium). \r\n Chemical: Aquatic herbicides are effective at temporarily controlling the weed but do not kill the tubers, turions (overwintering structures that detach and geminate in the spring), and seeds. Weed mats in public access sites have been used to contain spread,and signage to increase public awareness are some of the containment methods adopted (NIWA, 2003). In ponds and small lakes, water draw-downs, which expose and kill the plants, have been found effective. \r\n Physical: Harvesting and use of motorised boats is not recommended in partially infested lakes or where uncontamainated waterbodies occur nearby, because this can chop the plants and facilitate spread of shoot fragments (NIWA, 2003). The result is a score of 20 and a recommendation of: reject the plant for import (Australia) or \r\r\nspecies likely to be a pest (Pacific). A Risk assessment of \r\r\n Hydrilla verticillata for Australia was prepared by Pacific Island Ecosystems at Risk (PIER) using the Australian risk assessment system (Pheloung, 1995). It has been classified as a Nationally Banned Plant List species in New Zealand. ![]() verticillata is on the United States Federal Noxious Weed List, but aquarium supply sales continue through the Internet. These antonyms of the word submerge are provided for information only.Preventative measures: H. is more than 70,800 synonyms and 47,200 antonyms available. This site allows you to find in one place, all the synonyms and antonyms of the English language. In your daily life, for writing an email, a text, an essay, if you want to avoid repetitions or find the opposite meaning of a word. The words blockage, encumbrance, handicap are antonyms for "help". The words acknowledge, enjoy, welcome are synonyms for "appreciate". Antonyms are used to express the opposite of a word. Antonym definitionĪn antonym is a word, adjective, verb or expression whose meaning is opposite to that of a word. This avoids repetitions in a sentence without changing its meaning. Synonyms are other words that mean the same thing. NorthendĪ synonym is a word, adjective, verb or expression that has the same meaning as another, or almost the same meaning. Extract from : « Garden Ornaments » by Mary H.Then submerge them under two inches of soil at a temperature of seventy degrees.Extract from : « Cappy Ricks Retires » by Peter B.Take care of the scuttle don't let them close it down, or they'll submerge and drown us.Extract from : « The Thick of the Fray at Zeebrugge » by Percy F.Too late the astounded and terrified Huns sought to submerge.We decide not to let it come any nearer, and give the alarm to submerge.Extract from : « The Voyage of the Deutschland » by Paul Knig.I decide nevertheless not to submerge, as our courses must soon diverge.Extract from : « The Story of Our Submarines » by John Graham Bower.For six miles in the narrows it is too shallow for a submarine to submerge.Extract from : « A Modern Mercenary » by Kate Prichard and Hesketh Vernon Hesketh-Prichard.Have we not all our deluges in private that submerge our world in tears?.Extract from : « The Ghost » by William.Would that it could broaden and increase to a general deluge, and submerge the world!.Extract from : « Oh, You Tex! » by William Macleod Raine.But it had been impossible even for grief to submerge the sweet youth in her.Extract from : « Heroes of the Telegraph » by J.Was it possible to submerge the cable in the Atlantic, and would it be safe at the bottom?.
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