Mathen, K.George, M.V.Chandy Kurian2014-08-122014-08-121973Indian J.Agrl.Sci. 1973 v-43 i-2 p-106-109http://hdl.handle.net/123456789/4751The total population of Stephanitis typicus Distant, a pest of coconut foliage, could be projected from the sample population obtained by counting the total number of pests present on 20% leaflets at the middle region of 20% leaves. The innermost leaves were taken for sample in each palm. The sample population multiplied by a constant (3-76) gave the estimated population within 5% error on groups of palms, the number in each group being not less than 10.enArticle