A Manual for Citrus Growers1947 - 141 páginas |
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Página 39
... insects with various chemicals with the minimum of injury to the tree itself . The problem is complicated because the order of the importance of the various pests may vary in some localities and also the dates of hatch- ing and other ...
... insects with various chemicals with the minimum of injury to the tree itself . The problem is complicated because the order of the importance of the various pests may vary in some localities and also the dates of hatch- ing and other ...
Página 40
... insects . These materials are excellent for the control of aphids when these insects are present . Oil sprays kill by contact of the oil film with the insects , probably by closing the breathing tubes . The oils used do not readily ...
... insects . These materials are excellent for the control of aphids when these insects are present . Oil sprays kill by contact of the oil film with the insects , probably by closing the breathing tubes . The oils used do not readily ...
Página 52
... insect pests of citrus trees is the introduction of other insects that prey upon them . Classic examples of this are the control of cottony cushion scale by the Vedalia ladybird beetle ; the control of the citrophilus mealybug by the ...
... insect pests of citrus trees is the introduction of other insects that prey upon them . Classic examples of this are the control of cottony cushion scale by the Vedalia ladybird beetle ; the control of the citrophilus mealybug by the ...
Índice
Chapter Page 1 SOILS CLIMATE WATER | 2 |
CITRUS TREES | 4 |
IRRIGATION PRACTICES | 11 |
Direitos de autor | |
18 outras secções não apresentadas
Palavras e frases frequentes
100 gallons acid alkaline ammonia amount applied areas black scale boxes per acre brown rot carbon cause chemical chlorosis Citrus Diseases Citrus Experiment Station citrus fruits citrus growers Citrus Leaves citrus trees copper COST PER ACRE County cover-crops crop cultivation Cultural Cost damage dust effective fertilizer field boxes foliage fumigation fungus furrows grapefruit grove growth heavy inches injury insects irrigation irrigation water juice leaf lemons lime manganese deficiency manures material mealybug method mixture moisture Mutual Orange Distributors navel navel oranges nitrate nitrogen oil spray orchard organic matter packed boxes parasites percent pest control phosphate phosphorus plow-sole potash pounds production profitable pruning red scale red spider rind root zone rootstock Rough lemon scaly bark Septoria soil sucker sulphate sulphur symptoms temperature thrips treatment trifoliate orange trunk usually Valencia orange virus weeds windbreak wood young trees zinc deficiency zinc oxide zinc sulfate