Nutrição do tomateiro e sua influência no desenvolvimento de ninfas de Bemisia tabaci (GENN.) biótipo B
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Data
2012-02-17
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Universidade Federal de Goiás
Resumo
The objective of this work was to evaluate the effect of tomato plants nutrition
on the development of B. tabaci (Genn) biotype B. The experiments were carried out in a
completely randomized design in a greenhouse at ambient temperature, moisture and
photoperiod, at the Escola de Agronomia e Engenharia de Alimentos (EA/UFG), Goiânia,
Goiás, Brasil. Each treatment had eight replicates with one plant per pot. Treatments used
to test the various contents of earthworm manure were the association of (soil + earthworm
manure: 100% + 0%; 80% + 20%; 60% + 40%; 40% + 60%; 20% + 80%, and 0% + 100%.
Treatments used to test the N/K rates were: 1/1; 2/1; 4/1; 8/1; 1/2; 1/4, and 1/8. To test the
different sources of organic nitrogen, the following treatments were used: chicken manure;
earthworm manure; cotton meal; castor beans meal, as well as the mixtures (chicken
manure + earthworm manure + cotton meal + castor beans meal. To test the various
sources of mineral nitrogen, the following treatments were used: urea, ammonium sulfate;
LL®; calcium nitrate and a mixture of fertilizers (urea + ammonium sulfate + Nitro LL® +
calcium nitrate). The infestations were performed 40 days after plugs transplant, by
releasing 50 couples of B. tabaci biotype B into screen bags, placed in the third or fourth
leaf of each plant. One day after infestation 300 eggs were counted and marked on each
infested leaf. Ten days after infestation the amount of unviable eggs were evaluated and
first ínstar nymphs marked. The analysis of nymphs development was performed 21 days
after infestation in the experiment used to test different sources of nitrogen and N/K rates;
and, at 30 days after infestation in the experiments used to test the different levels of
earthworm manure. B. tabaci nymphs biotype B showed elongation and mortality in that
phase, probably due to antibiosis developed by tomato plants: cultivated in earthworm
manure only (egg-adult viability 30% and 44% population reduction); fertilization
according to N/K 1/8 rate (egg-adult viability 13% and 69% population reduction);
fertilized with chicken manure (30% egg-adult viability and 41% population reduction);
and, fertilized with calcium nitrate (25% egg-adult viability and 57% population
reduction).
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Oliveira, Marcos Fernandes - Nutrição do tomateiro e sua influência no desenvolvimento de ninfas de Bemisia tabaci (GENN.) biótipo B - 2012 - 191 f. - Tese - Programa de Pós-graduação em Agronomia (EAEA) - Universidade Federal de Goiás - Goiânia - Goiás - Brasil.