Pyrethrum
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Item Nematoses of Pyrethrum in East Africa(Nature, 1958) Whitehead, A.; East African Agriculture and Forestry Research OrganizationDALMATIAN pyrethrum (Chrysanthemum cinerariaefolium) (Trev.) Vis. is widely attacked in Kenya and Tanganyika by species of the nematode genus Meloidogyne Goeldi (root-knot nematodes), in particular Meloidogyne hapla Chitwood, 1949, which is a new host record.Item A Note on the Possibility of the Stabilization of Pyrethrum(January 1948) Raymond, W.D.; Padhye, V.P.; F.R.I.C., Chemical Laboratory, Dar es SalaamFollowing work [1] oh the stabilizing effect of sulphur dioxide on papain, our attention sk as drawn to a paper by Mario Covello [2] on the inactivation of the oxidases in pyrethrum flowers with the resultant stabilization of the dried product. Covello's work was carried out on flowers in different stages of development and by different methods of drying. The development stages were:—(1) the dlosed flower heads, the heads just opened, the head completely opened, more matured flowers than No.-3,'(5) the heads completely mature and, partly, dried on the plant.Item Pyrethrum Drying(1937) Kenya Agricultural Research Institute; Department of Agriculture KenyaWhen first the subject of the artificial drying of pyrethrum was raised, the only information available was to the effect that drying at a temperature of 40º C. (104ºF.) caused no loss of pyrethrins. Accordingly, it was recommended that drying houses should be run at temperatures between 100 and 105 0 F. For weather, produced very dingy flowers various reasons, discussed below, drying was very slow, and soon higher temperatures were being employed. Drying houses run at over 150º F. have been It is strongly recommended that the visited.Item The "Black Rot" Condition in Pyrethrum in Tanzania-Nematological Investigations(1967) Schoemaker, R.L.P.W.; Ledger, M.A. ; E.A.A.F.R.O., Kikuyu, KenyaAn experiment is described in which pyrethrum and chrysanthemum plants were inoculated with chrysanthemum leaf eelworm (Apltelenchoides ritzemabosi). After II weeks only one Aphelenclzoides specimen was recovered from pyrethrum, while a dense population was present on chrysanthemum. This result proves that pyrethrum is not a suitable host for the chrysanthemum leaf eelworm.
