A handbook of the destructive insects of Victoria, with notes on the methods to be adopted to check and extirpate them . also useful againstborers, white ants, &c, &c. In the case of plants of thecitrus family generally this would be partly impractic-able, the branches being prickly and twiggy, still it couldbe done on the tree up as far as where the branches meet F 2 68 DESTRUCTIVE INSECTS OF VICTORIA. the stem, as is ofteu done in the case of treating forpeach aphis, &c. As this new pest of the orange is happily of rareoccurrence, we may not be much troubled with it, butbeing an indigenous m
A handbook of the destructive insects of Victoria, with notes on the methods to be adopted to check and extirpate them . also useful againstborers, white ants, &c, &c. In the case of plants of thecitrus family generally this would be partly impractic-able, the branches being prickly and twiggy, still it couldbe done on the tree up as far as where the branches meet F 2 68 DESTRUCTIVE INSECTS OF VICTORIA. the stem, as is ofteu done in the case of treating forpeach aphis, &c. As this new pest of the orange is happily of rareoccurrence, we may not be much troubled with it, butbeing an indigenous moth we can hardly expect to get ridof it altogether. Now, however, that we know somethingof its habits and life-history we may be able to at oncerecognise it from the figures on the plate, and take stepsfor its eradication. 70 DESTRUCTIVE INSECTS OF VICTORIA : PLATE XXIV. The Orange Aphis (Siphonophora ? sp.). Fig. 1. Branch of orange, showing insects on stem. Natural size. 2. Wingless female. Magnified. 3. Winged female. Magnified. 4. Pupa. Magnified,o. Pupa. Magnified. 6. Pupa, early stage. Plate XXIV. THE ORANGE APHIS. 71 CHAPTER XXIX. THE ORANGE APHIS. ( Sip lion op hora f sp.)Order : Hemiptera. Sub-order : Homoptera. Family : Aphidce. A small dark-coloured species of aphis, not unlike ingeneral appearance that of the so-called Black Aphis ofthe Peach. The viviparous wingless female (see Plate XXIV.,Fig. 2) is often brown, sometimes of a dark-green colour,shorter and broader than many species of this group,nearly all of which are more or less destructive to theorchardist, and sometimes to the farmer also. The pupae are of various colours, often greyish or darkolive-green (see Figs. 4, 5, and 6, which have beenenlarged and drawn from nature). The winged female(see Fig. 3) is of a dark leaden grey colour, with finewings, on the upper pan of which are faint orange-colouredmarkings. On Fig. 1 will be seen a portion of orange stem, wherethe aphides (natural size) are
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