A preliminary report of a nematode observed on citrus roots and its possible relation with the mottled appearance of citrus trees . rating deeply. The head of the nematodehas penetrated nearly to the point of the arrow. on the tiny rootlets, one would conclude that there must be millionsof nematodes in and around the root system of one tree. Thesediseased groves examined are as bad as any in the entire state. In mostcases they have been large producers in the past, but at the present time they are giving very little fruit that is at all marketable and thisis of an inferior quality. In most cas
A preliminary report of a nematode observed on citrus roots and its possible relation with the mottled appearance of citrus trees . rating deeply. The head of the nematodehas penetrated nearly to the point of the arrow. on the tiny rootlets, one would conclude that there must be millionsof nematodes in and around the root system of one tree. Thesediseased groves examined are as bad as any in the entire state. In mostcases they have been large producers in the past, but at the present time they are giving very little fruit that is at all marketable and thisis of an inferior quality. In most cases the trees thus badly diseasedhave only small sickly yellow fruit which is the typical condition ofbadly mottled, deteriorated trees. The principal symptoms which have generally been recognized inconnection with mottled leaf or decadence, as it is popularlycalled, are that the tree fails to develop normally, but grows tall andslender. The leaves are small and of a sickly yellow color, or theymay be mottled, the veins remaining green while the portion betweenis yellow (Fig. 7). Trees only slightly affected bloom normally and. Fig. 4. Orange rootlet highly magnified, showing a nematode nearthe center of the field. 10 produce good fruit, while more seriously diseased trees often bloomprofusely and produce small fruit of a pale yellow color. Such treesare unprofitable. Sometimes only a portion of a tree is affected. Ina very large percent of cases the southeast side of the tree has beenthe most seriously affected. Mottled leaf is found mostly on sandy soil. Many instances havebeen noted where there is a sandy streak running through a grove, andhere the diseased trees occur, while the rest of the grove which ison heavier soil may be in a healthy condition. The moisture contentof sandy soil varies much more than that of heavy soil in the same
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherberke, bookyear1913
