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• W2292568569 abstract "Summary An .account is given of an outbreak, in Swaziland, of a leaf-sucking insect, Numicia viridis, Muir, on sugarcane of the variety N:Co.310. A brief descrip­ tion of the insect is followed by a discussion on symp­ toms and effects on the sugarcane plant. Among control measures, burning and harvesting of millable cane and treatment of the remainder with malathion dust were effective in reducing the infestation. A survey has revealed the presence of Numicia, although only in small numbers, on sugarcane in Natal. Historical The land selected for sugarcane cultivation on Tambankulu Estate, in the north of Swaziland, is level or, at most gently sloping and the volcanic soil is rich and of good structure. A scientifically designed and efficiently operated system of overhead irrigation makes available adequate supplies of water, brought in channels from the Komati River. From the start, fertilizer application has been generous. Under these conditions the cane, which consisted exclusively of the variety N:Co.310, developed so rapidly and appeared so healthy that it aroused the envy of visiting growers from other areas. Towards the end of 1961, somewhat more than four years after cane was first planted in this area, it began to be noticed that the crop in some fields was beginning to suffer from a malady, the cause of which was not immediately apparent. Although some insects were observed, it was not at first obvious that they were responsible for the condition, and investigations were carried out on a number of other factors includ­ ing soil and fertilizer, trace elements, water supply and drainage, and the possible occurrence of diseases. By July, 1962, however, when symptoms had become acute over a considerable part of the thousand-acre sugarcane plantation, insects were present in such large numbers that their connection with the malady became apparent. Identity of the Insect Specimens, which were sent to the South African Division of Entomology and thence to an expert in Brussels, were identified as Numicia viridis, Muir, (Fulgoroidea: Tropiduchidae). The original descrip­ tion of this species2 is contained in a paper, published in 1931, dealing with specimens in the British Museum. The habitat is given as Natal: Weenen and Pondoland: Port St. John and the date of collection as 1924. There is no record of host plants but, from the locali­ ties cited, it is obvious that they were not collected on sugarcane." @default.
• W2292568569 created "2016-06-24" @default.
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• W2292568569 date "1963-01-01" @default.
• W2292568569 modified "2023-09-27" @default.
• W2292568569 title "THE GREEN LEAF-SUCKER OF SUGARCANE NUMSCIA" @default.
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