Behavior of the mites in tomato culture and measures for their control, at houses of protected cultivation.
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Abstract
Bronzed in tomato culture is a damage caused by an eriophyoid mite, Aculops lycopersici Massé of very small size, yellowish and invaluable at simple sight. The symptoms characterise for bronzed or rust in the first shaft and leaves and even in fruits, from the basal part of the plant in upward evolution. With the development of this a drying of the leaves takes place. Among of the mite species that cause more
damages of economic importance in tomato, it is besides this to Polyphagotarsonemus latus Banks also well known as “white mite." With the objective to know the behaviour of these mites and their possibilities of control with less aggressive methods to the environment, it was carried out this study in the houses of protected cultivation, in sow of spring and summer seasons. Tomato seedlings were sowed (Hybrid HA-3108), in three different dates 15-4-03, 13-6-03 and 14-8-03. The plants were evaluated weekly from 17 to 35 days after the transplant. The number and species of mites per leaf, as well as climatic conditions surrounding tomato culture were recorded. Finally, correlation and linear regression analysis were carried out between mites’ infestation (% for each species) and climatic factors. Aculops lycopercisi was presented with more intensity, the attack of this mite caused damages of consideration that ended up in occasions to destroy great quantity of plants in the crop stage and to damage the fruits, this happened mostly in the hot periods from March until September. Was observed on this mite the attack of the pathogenic fungus Hirsutella thompsonii in the humid times. In the freshest periods also appeared the white mite P. latus but their damages were less important. Less aggressive control methods were recommended zineb and sulphur in powdered, preventive measures and a monitored methodology to evaluate and apply the mites under these conditions.
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References
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