Brown bed bug: either him or the cotton

Among the species of bedbugs known in Brazil, Scaptocoris castanea is considered one of the most important, not only due to its wide geographic distribution in several Brazilian states, but also

10.11.2015 | 21:59 (UTC -3)

Since 1949 the brown stink bug,

It is considered a pest of several crops of great economic value in the state of São Paulo, especially cotton and sugar cane. The occurrence of this pest in these crops is cyclical, going unnoticed or absent for consecutive years.

In recent years, this insect has been recorded in corn, peanut, tomato, sorghum, banana crops and mainly in pastures. In the last two cotton harvests in Mato Grosso, severe infestations of this pest were observed in the Mato Grosso cotton crop, mainly in direct planting areas.

The brown stink bug belongs to the order Hemiptera, suborder Heteroptera, superfamily Pentatomoidea and family Cydnidae. It is an insect with an underground habit that, by sucking sap from the roots, causes yellowing, followed by drying and death of the plant.

The adult insect measures approximately 8mm in length, light brown in color, has fossorial anterior legs, antennae with five segments), styliform mouthparts curled within the second sacciform segment, median tibiae with a flat, glabrous dorsal area and strongly spinous posterior tibiae. The eggs are laid singly in the soil, close to the roots of the plants and are white in color and oval in shape; The nymphs are white in color and go through five instars.

They initially attack in reboleira, and if preventive control has not been carried out, the damage caused can be quite severe, forcing the cotton grower to repeat the soil preparation for new planting. When the attack is less intense, the leaves of the plants may only turn yellow and then redden, some withering. Its presence in the cultivation area can be seen during soil preparation, as when disturbed it exudes a strong and characteristic smell. In drier times, they go deeper into the soil and look for more humid regions, during the rains, they return to the surface.

Several researchers report that chemical control of the brown stink bug must be preventive, with insecticide applications in the planting furrow, however, the majority of recommended insecticides are currently incompatible with integrated pest management and/or current legislation. Prado et al. (1986), studying the chemical control of the brown stink bug in cotton crops in Goiás, found that although there were no significant differences for initial stand, final stand and production, the productions obtained with carbofuran, heptachlor and phorate represented, on average, around 26,5% more than that obtained with the witness (without control). With aldrin 5%, there was a depression in production, which practically equaled the control.

Therefore, it is suggested to carry out advance soil preparation and preventive control through the application of the insecticide carbofuran in the planting furrow at a concentration of 350g/kg, at a dosage of 3000 to 4000 g.i.a./ha.

The losses are great

A pest that is difficult to control and has made the lives of Cerrado farmers hell. It is the Brown Bug, whose damage arouses concern among producers. So says Blairo Maggi, who in Rondonópolis (MT) had to replant a thousand hectares of cotton because of the damage caused by the sucking insect. Maggi estimates that he had to spend R$400 replanting the damaged crop. To better visualize the damage, the lower productivity index that will be at the site must also be added.

Contrary to what has already been thought, the stink bug can occur in both direct and conventional seeding systems. The insect attacks several crops, such as corn, beans, pastures, soybeans and sunflowers, but has a special taste for cotton. Among the areas that suffered most from the plague are the states of Mato Grosso, Goiás, Mato Grosso do Sul, São Paulo, Tocantins, Minas Gerais and Paraná.

Carlos A.D. da Silva

Embrapa Cotton

Mosaic Biosciences March 2024