Article

CONTROLE BIOLÓGICO DE ARTRÓPODES PRAGAS DO ALGODOEIRO COM PREDADORES E PARASITÓIDES

01/2006;

ABSTRACT RESUMO: Insetos entomófagos, predadores e parasitóides, constituem os principais grupos de inimigos naturais, que atuam na regulação populacional dos insetos-praga em muitos sistemas agrícolas. A ação desses inimigos naturais sobre a população de uma espécie-praga chama-se controle biológico. Na cultura do algodoeiro encontra-se um grande número de inimigos naturais associados às pragas dessa cultura, contudo a atuação e/ou utilização desses insetos são limitados pelas excessivas aplicações de inseticidas na lavoura. Uma das maneiras para a utilização do controle biológico é através da associação deste no manejo integrado de pragas com adoção de práticas de sistemas de amostragens, nível de controle, nível de não ação, que auxiliarão na tomada de decisão no controle de pragas e o uso de inseticidas seletivos aos inimigos naturais. Essas práticas favoreceriam a adoção do controle biológico por incremento e conservação de inimigos naturais que ocorram naturalmente no agroecossistema algodoeiro. Assim, o objetivo dessa revisão é relacionar as principais pesquisas desenvolvidas para a utilização do controle biológico dos principais artrópodes pragas do algodoeiro no Brasil. Termos para indexação: Manejo Integrado de Pragas, algodao, predação e parasitismo. ABSTRACT: Entomophagous insects, predators and parasitoids are the main group of natural enemies which is involved on the regulation of the pest population in several agricultural systems. Then, the science of biological control is related to the effect of these natural enemies under the pest population. In cotton there is a great number of natural enemies, however the usage of these organisms is limited due to the massive spray of insecticides. One method for using the biolocical control on cotton fields is linking this in an Integrated Pest Management program considering sampling models, economic thresholds, inaction levels which will help on pest control decisions. These practices would help the adoption of biological control by augmentation and conservation of natural enemies related to cotton fields. Then, the objective of this review paper is to compile information regarding biological control researches in cotton on Brazil.

0 Bookmarks
 · 
300 Views
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Effects of photoperiod on reproduction and longevity of Podisus nigrispinus (Dallas) (Heteroptera: Pentatomidae) were assessed under seven different photophases (10, 11, 12, 13, 14, 15, and 16 h) at a constant 28 +/- 1 degrees C temperature and 70 +/- 10% RH in the laboratory. Photoperiod affected the longevity of P. nigrispinus females. The highest longevity (24.10 d) occurred with a 15-h photoperiod, compared with longevity of 9.75 d at 12-h photoperiod. The preoviposition period of P. nigrispinus was influenced by the photoperiod. The preoviposition period of P. nigrispinus was longer for the 16-h photoperiod (7.25 d) than for the 12- (4.06 d), 13- (4.00 d), and 14-h (3.68 d) photoperiod. The postoviposition period, the number of egg clutches per female per day, and the interval between egg clutches were not affected by the photoperiod. The postoviposition period ranged from 1.46 d (at 14 h of light) to 3.71 d (at 11 h of light). The number of egg clutches per female per day varied between 0.19 (at 11 h or 14 h of light) and 0.40 (at 15 h of light). The interval between egg clutches ranged from 1.29 d (at 14 h of light) to 2.07d (at 11 h of light). The variation in the number of eggs and egg clutches per female of P. nigrispinus in relation to their age varied according to the photophase to which they were exposed. The fecundity of P. nigrispinus females was higher in 15 h of light. These informations serve as a valuable ecological variable in modeling population dynamics of P. nigripinus, both in the field and in the laboratory, thereby contributing to the success of A. argillacea control programs.
    Annals of the Entomological Society of America 07/2010; 103(04):603-610. · 1.17 Impact Factor

Full-text (2 Sources)

Download
129 Downloads
Available from
May 22, 2014