. Il capo della scala pregiudizievole-insetti del Connecticut. Scala di insetti. ARMORED scale. Ho 5 infatti è quasi di forma conica, rossastro o marrone quasi nero, con un apice di colore arancione ed è mostrato nella figura 15. Pre- sumably continua a razza di tutto l'anno sotto vetro e proseguire la spruzzatura è necessario tenerlo sotto controllo. 26. MORGAN'S SCALA - Chrysomphalus dictyospermi Morg. Questa specie è una peste seria di Palms at Pierson grande com- mercial serre, Cromwell, ed è stato anche preso in impianto privato case in altre parti dello stato. È di circa lo stesso colore come il prec

• Collaboratore: Library Book Collection / Alamy Foto Stock
• ID dell’immagine: RJ9A35
• Dimensioni dei file: 7,1 MB (352,3 KB Download compresso)
• Liberatorie: Modello - no | Proprietà - no
• Dimensioni: 2481 x 1007 px | 21 x 8,5 cm | 8,3 x 3,4 inches | 300dpi

Altre informazioni

Questa foto è un'immagine di pubblico dominio, il che significa che il copyright è scaduto o che il titolare del copyright ha rinunciato a tale diritto. Alamy addebita un costo per l'accesso alla copia ad alta risoluzione dell'immagine.

Questa immagine potrebbe avere delle imperfezioni perché è storica o di reportage.

. The chief injurious scale-insects of Connecticut. Scale insects. ARMORED SCALES. I 5 In fact it is almost conical in shape, reddish brown or nearly black, with an orange apex, and is shown in Figure 15. Pre- sumably it continues to breed throughout the year under glass, and continued spraying is necessary to keep it in check. 26. MORGAN'S SCALE — Chrysomphalus dictyospermi Morg. This species is a serious pest of palms at Pierson's large com- mercial greenhouses, Cromwell, and it has also been taken in private plant houses in other parts of the state. It is of about the same color as the preceding species, but is flatter, and pro- jects only slightly from the leaf. Mr. H. E. Hodgkiss studied this scale at the Massachusetts Agricultural College, and found that several generations are produced each year, but these over- lap so as to become indistinct. The females bring forth living young, are parthenogenetic, and males are unknown. Fumi- gating the house with hydrocyanic acid gas, using 7.5 grams potassium cyanide for each 100 cubic feet of space, for forty minutes, after dark, with the plants free from moisture, is the treatment advised by Mr. Hodgkiss after making many experi- ments. It is probably a safe remedy for nearly all of the greenhouse scales. 27. OYSTER SHELL SCALE—Lepidosaphes uhni Linn (formerly Mytilaspis pomorum Bouche). One of the most common and widely distributed of all coccids. It is a pest of fruit trees, especially apple, and many young sprouts and seedlings of birch, poplar, willow, ash and butternut are killed by it each year. Lilac is also infested. There is but one brood annually, and the insect winters in the form of oval white eggs under the female shells. The eggs hatch in Connec- ticut about the first of June, the young, crawl for a few hours, then settle upon the bark and form shells, becoming mature in Septem- FlG- l6- °3'ste[she11 scale ' & on poplar. ber. Eggs are laid about the first of October, and the females die. The fem

Parole chiave associate all'immagine

• bookcentury1900
• bookdecade1900