Manuel de légume-insectes jardin . oncowpea eding, navet, cabbageand ofDesmodium plusieurs espèces. Champs Sometimesentire beenruined ont par les attaques de ce rouleau de feuilles. Dans le southernpart extrême de la Floride et dans thetropics breedscontinuously l'insecte, tout au long de l'année. Dans le nord de la Floride Fig.il hibernatesin sans aucun doute le stade pupal. La première portée de papillons apparaît en mars. Le papillon a une étendue d'environ si po.Les ailes sont brun chocolat foncé ; les ailes avant, aremarked avec plusieurs taches blanc argenté angulaire. Les ailes postérieures sont meublées avec une longue queue, de sorte

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Manual of vegetable-garden insects . eding oncowpea, turnip, cabbageand several species ofDesmodium. Sometimesentire fields have beenruined by the attacks ofthis leaf-roller. In the extreme southernpart of Florida and in thetropics, the insect breedscontinuously throughout theyear. In northern Florida Fig.it undoubtedly hibernatesin the pupal stage. The first brood of butterflies appears inMarch. The butterfly has an expanse of about If inches.The wings are dark chocolate brown; the front wings, aremarked with several angular silvery white spots. The hindwings are furnished with long tails, somewhat similar to thoseof the swallowtail butterflies (Fig. 57). The butterfly lays its eggs singly or in groups of four to sixon the underside of the leaves. Occasionally three to four eggsare piled one above the other in a vertical column. The eggis nearly globular, slightly flattened at both ends and markedwith a series of delicate longitudinal ridges. It is nearly -^inch in length. When first laid, the eggs are glistening white, . The bean leaf-roller butterfly(X U). 82 MANUAL OF VEGETABLE-GARDEN INSECTS gradually changing to a clear yellow. In summer the eggshatch in four days and the young caterpillars immediatelybegin to eat out small i)atchcs in the surface of the leaves.Within a day after hatching, the larva constructs a retreat byfolding over a flap of the leaf made by cutting along two linesconverging from the margin. Within this retreat the larvalives, coming out only to feed. When about to molt, the edgesof the retreat are sealed. In the third or fourth stage, thecaterpillar constructs a new retreat by folding over a leaflettowards the middleon the upper side. During the course of itsdevelopment, the larva passes through five stages. Themature caterpillar is over 1^ inches in length. The head isbrownish black and the body yellowish sprinkled with black, lighter below. The head is separated from the body by adistinct neck. The length of the larval period varies fromtw

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