. Cirtus frutti sotto irragation. Agrumi; frutta-cultura. macchie sulle sue ali. È anche noto come il bug di verde e come le dodici-spotted cetriolo beetle; è spesso scambiato per una qualche forma di coccinelle coleotteri. L'insetto attacchi principalmente i giovani e la crescita di gara su alberi di arancio; esso raramente attacchi il limone. Sia l'adulto e la larva si nutre di alberi; gli attacchi degli adulti giovani, gara con fogliame parti della struttura e la larva attacca le radici. Fig. 28 illustra il lavoro di questo insetto sulla chioma di colore arancione. In primavera le uova sono previste intorno alla base del

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. Cirtus fruits under irragation. Citrus fruits; Fruit-culture. spots on its wings. It is also known as the green bug and as the twelve-spotted cucumber beetle; it is often mistaken for some form of the ladybird beetles. The insect principally attacks the young, tender growth on the orange trees; it very seldom attacks the lemon. Both the adult and the larva feeds on the trees; the adult attacks the young, tender foliage parts of the tree and the larva attacks the roots. Fig. 28 illustrates the work of this insect on the foliage of the orange. In the spring eggs are laid around the base of the tree, about i inch under the ground. They soon hatch into white grubs, § 24 CITRUS FRUITS UNDER IRRIGATION 51 which begin immediately to feed on the roots. The larvas pupate in the ground and the adults emerge in about 2 weeks and begin feeding on the foliage. Although the larvas do much damage, it is not generally necessary to resort to control measures for them. The adults, however, should receive attention. If the trees are small and can be easily jarred the beetles can be shaken from them in early morning when they are sluggish on to a sticky or an oiled screen. They can then be collected and destroyed. Another method. Fig. 29 is to spray the tender growth of the trees with poison. A spray consisting of 8 pounds of arsenate of lead to 200 gallons of water will hold the beetles in check. 47. Thrips.—Often, if the blossoms of orange or lemon trees are shaken in the hand, many minute yellowish or brown- ish insects known as thrips can be seen running around. These insects feed on the blossoms and tender tissues. If not too numerous they do little harm, but if in abundance they may shorten the crop. After the blossom has cast the petals and other temporary structures, it is common for them to feed on. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations m

Parole chiave associate all'immagine

• bookcentury1900
• booksubjectcitrusfruits
• booksubjectfruitcultur