The expansion of agriculture in the semi-arid region of northeastern Brazil has been associated to an increase in the number of insect pests and the indiscriminate use of agrochemicals. We performed a field survey of two major okra pests, Aphis gossypii and Bemisia tabaci, taking into consideration their within-plant vertical distribution. We also investigated the presence of parasitized insects and the short-time effect of the application of deltamethrin. Throughout the experiment, 59,787 phytophagous insects were collected, which were categorized in four groups: healthy nymphs/adults of Aphis gossypii (N = 31,767), A. gossypii parasitized by Hymenoptera (N = 4189), Bemisia tabaci eggs (N = 2507) and B. tabaci nymphs (N = 21,324). The abundance of A. gossypii was higher than that of B. tabaci at both, the control and the insecticide-treated area. The frequency of parasitism of A. gossypii by Hymenoptera was higher in the areas that did not receive deltamethrin. Higher numbers of A. gossypii occurred in the middle part of the plants and B. tabaci populations were lower in apical leaves.
You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither BioOne nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the BioOne website.