. I nemici di insetti e malattie del pomodoro. theaffected parti cresce awhite stampo bysmall coperto da bianco a marrone rossastro organismi circa il sizeof seme di senape. Queste masse aredense di . funguscalled sclerozi da cuiè malattia prende il suo nome. Controllo. - Prune andstake piante aerateand asciugare la superficie soiland mantenere i rami offi massa. EABLY BI/UCE. Inizio batterico (fig. 12) af-detta esposizione può provocare effetti nocivi sulla salute foglie, steli e frutta.Il frutto è chiamato nailhead ruggine. Spesso è de-veloped in il seedbed andcarried al campo di theplants. Controllo.-spruzzo la plantsin il seedbed con debole(2: 2: 50

• Collaboratore: The Reading Room / Alamy Foto Stock
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. Insect enemies and diseases of the tomato. theaffected parts grows awhite mold covered bysmall white to reddish-brown bodies about the sizeof mustard seed. These aredense masses of . funguscalled sclerotia from whichthe disease takes its name. Control. — Prune andstake the plants to aerateand dry the surface soiland keep the branches offthe ground. EABLY BI/IGHT. Early blight (fig. 12) af-fects leaves, stems, and fruit.On the fruit it is called nailhead rust. It is often de-veloped in the seedbed andcarried to the field on theplants. Control.—Spray the plantsin the seedbed with weak(2: 2: 50) Bordeaux mixtureand set in the field onlyplants that are free from thedisease. If after these pre-cautions the disease developsin the field, spray as directedunder Spraying Tomatoes. ROOT KNOT. Root knot (fig. 13) iscaused by very tiny wormscalled nematodes, which at-tack cotton, cowj)eas, melons, okra, beets, tomatoes, pota-toes, and other plants. Soilcan be freed from this pestonly by planting it for twoor three years in crops which. Fic. 14.—Sclerotium blight of tomato, and decay of stem at surface of Infectionround. 13 SOUTHERN TOMATO BLIGHT. Southern tomato blight is somewhat similar to tomato wilt, butit kills the plant more quickly. In fact the whole crop may be jie-stroyed within a fewdays. In both thesediseases there is adarkening of the stemjust under the bark, but in the case of to-mato wilt this area isdark-brown to blackwhile in southern to-mato blight it is yel-low. The disease iscaused by a bac-t e r i u m which isspread by insects. Control.—Burn in-fected plants andspray the others witliBordeaux mixturecontaining % percent of lead arsenate. LEAF SPOT. Leaf spot (fig. 15)is a fungus disease, causing small, circu- „ ^ „ . ^.r . • , 1 ^. ., , , . , , Fig. 15.—Leaf spot of tomato. Note size, shape, and lar spots with light color of spots.

Parole chiave associate all'immagine

• bookcentury1900
• bookdecade1910
• bookpublisherwash
• bookyear1919