. Gli insetti ed altri parassiti alleate di Orchard, Bush e serra la frutta e la loro prevenzione e trattamento . Pesti di insetto; frutta. 250 pesti di insetto. Nel 1898 molte femmine avere sul parafango tardiva come 16tli di (Jctober. Questi migratiiio- femmine vivipara volare torna a damson e pruno selvatico, ma come detto prima, in numero inferiore alle altre prugne. Ho visto anche loro dando luogo alla generazione successiva su hawthorn hedo-es e ciliegia, ma questi ultimi mai snrvived. Questo migra- tion" per quanto oljservations go, avviene principalmente su ancora giorni e quando l'aria è calda. Tliey non sembrano

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. The insect and other allied pests of orchard, bush and hothouse fruits and their prevention and treatment . Insect pests; Fruit. 250 Insect Pests. in 1898 many females Avere on the wing as late as the 16tli of (Jctober. These migratiiio- viviparous females fly back to damson and sloe, but, as stated before, in smaller numbers to other prunes. I have also seen them giving rise to the next generation on hawthorn hedo-es and cherry, but these latter never snrvived. This migra- tion" as far as oljservations go, takes place chiefly on still days and when the air is warm. Tliey do not seem to fly instinctively to the damson, l3ut rather are carried there by chance. Oaks, ash and all manner of trees get covered by the migrants, the majority of whicli could never reach the prunes, and even where a large damson plantation adjoined a hop garden, thonsands of the aphides were. ((4lT;Uly r '-I'AMSmN AiMHS. , hU-L-.l) nioing in an opposite direction. Tdie direction of their migration is, it seems, dependent on currents of air—hence hundreds of thousands die, for the ovigerons females do not seem to lie able to live on other trees than prunes. These migrants, a few hours after they have become located on their piroper plant, produce a few lice, which grow into ovi]iarous wingless females. It seems that these winged return-migrants pirodnce very few lice, usually only four are produced by each winged female, Imt a few give rise to ii^ e or six. The emliryos can easily be seen in the parent's body. About this time winged males also mak'e tlieir appearance. These males are suuiller tlian tlie N"inged females. They come. 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 may not perfectly resemble the original work.. Theobald, Frederick Vincent, 1868-1930. Wye, Eng. : Frederick V. Theobald

Parole chiave associate all'immagine

• bookcentury1900
• bookdecade1900
• booksubjectinsectpests
• bookyear