. Insetti e Malattie delle piante : contenente rimedi e suggerimenti consigliati per l'adozione da parte degli agricoltori, frutta-dei coltivatori e giardinieri della provincia . Parassiti; le malattie fungine di piante; pesti di insetto. 60 Vict. Scheda provinciale op orticoltura. 39 in ciascun segmento ad eccezione del quarto e ultimo. Dopo l'ultima muta perde il suo aspetto viscido e di colore scuro e compare in un pulito pelle gialla completamente libera froiri slime. La sua forma è anche cambiato, essendo proporzionalmente più lunghi. In poche ore dopo questa modifica lascia la struttura ad albero e crawl o cade a terra, dove si seppellisce stesso per

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. Insect pests and plant diseases : containing remedies and suggestions recommended for adoption by farmers, fruit-growers, and gardeners of the province . Pests; Fungal diseases of plants; Insect pests. 60 Vict. Provincial Board op Horticulture. 39 under each segment except the fourth and the last. After the last moult it loses its slimy appearance and dark colour, and appears in a clean yellow skin entirely free froiri slime. Its form is also changed, being proportionately longer. In a few hours after this change it leaves the tree and crawls or falls to the ground, where it buries itself to a depth of from one to three or four inches. By repeated movements of the body the earth is pressed firmly on all sides, and an oblong oval chamber is formed, which is afterwards lined with a sticky, glossy substance, which makes it retain its shape. Within this little earthen cell the insect changes to a chrysalis, and in about a fortnight finishes its transformations, breaks open the enclosure, crawls to the surface of the ground, and appears in the winged form. About the third week in July the flies are actively engaged in depositing eggs for a second brood, the young slugs appearing early in August. They reach maturity in about four weeks, then retire underground, change to pupse, and remain in that condition until the following spring. Pear and cherry growers should be on the look-out for this destructive pest about the middle of June, and again early in August, and if the young larvae-are then abundant they should be promptly attended to, since, if neglected, they soon play sad havoc with the foliage, feeding upon the upper side of the leaves and consuming the tissues, leaving only the veins and under skin. The foliage, deprived of its substance, withers and becomes dark coloured, as if scorched by tire, and soon afterwards it drops from the trees. In a badly infested pear orchard whole rows of trees may sometimes be seen as bare of foliage during the eaily days of July

Parole chiave associate all'immagine

• bookcentury1800
• bookdecade1890
• booksubjectinsectpests
• bookyear