The Journal of the Department of Agriculture, Victoria . ans of effectively combating it. The Sootv Mould Fungus.—This fungus is known in many places as{Meliola camel lice. Sacc). Some difference of o])inion exists as to whetherthis is its right name. It does not appear to Ije definitely settled which ofthe species of this fungus—if the\ are various—feeds on the honeydew ofthe scale insects on different trees. It is verv probable, as pointed out byMr. McAlpine. that different species cause the trouble in different countriesand on difft-rent trees. The Black Blight {Capiiodium citricolum. McAlp
The Journal of the Department of Agriculture, Victoria . ans of effectively combating it. The Sootv Mould Fungus.—This fungus is known in many places as{Meliola camel lice. Sacc). Some difference of o])inion exists as to whetherthis is its right name. It does not appear to Ije definitely settled which ofthe species of this fungus—if the\ are various—feeds on the honeydew ofthe scale insects on different trees. It is verv probable, as pointed out byMr. McAlpine. that different species cause the trouble in different countriesand on difft-rent trees. The Black Blight {Capiiodium citricolum. McAlp.)which attacks citrus trees in this country, appears to live, like allied forms,on the sugary secretions of aphides and scale insects. Hf)wever this , it will usually be found sufficient for the i)ur])ose of the horticulturistto know that thr \arious forms of this fungus have a similar effect ininjuring the functions of the leaves, and that if the trees are ke[)t free fromthe i)resencc^ of scales or aphides the fungus also ceases to FIG. 24.— OLIVE TWIG ATTACKED BY RED SCALE (aSPIDIOTUS ROSSI). Trees attacked by the Black (31ive .Scale are usuallv easilv distinguishedby the dark appearance given them 1)\ the presence of the Sooty MouldFungus; the lea\es also become shiny and sticky in cases where the attackis severe. The chief injury caused by the fungus is the clogging up ofthe .stomata of the leaves, antl in cases where there is a bad attack thebranches and lea\es become almost completely covered with an incrustationcf this fungus, and, consquently. cannot properlv perform their functions. Treatment.—Since this disease derives its food supplies from the secre-tions of aphides or scale insects, it is obvious that by destroying you also do away with the food supplies of the fungus; and, as aresult, it .soon disappears. Hence the grower should direct his attentionfirstly to the destruction of the scales. However, to hasten the removalof the
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectagricul, bookyear1902
