Biological and morphological parameters of Dysdercus maurus fed with low- or high-oil cotton seeds

Carlos Alberto Domingues Da Silva,José Cola Zanuncio,Josivaldo Da Silva Galdino,Thiele Da Silva Carvalho

doi:10.1590/s1678-3921.pab2021.v56.02052

Abstract

Abstract: The objective of this work was to determine the biological and morphological parameters of Dysdercus maurus fed with cotton (Gossypium hirsutum) seeds with a high or low oil content, as well as to identify genotypes to be used in breeding programs as sources of resistance to this stink bug. The development, survival, and reproduction of the cotton stainer bug were determined in a completely randomized experimental design. The treatments consisted of the insect nymphs being feed with cotton seeds of the CNPA 2001-5581 (high oil content) or CNPA 2001-5087 (low content) genetic line. Survival, weight, and morphological parameters of the bug were determined. The survival of second- and third-instar nymphs and of the total nymph stage of D. maurus was lower with cotton seeds with a low oil content. The body length and head width of D. maurus adults were greater, but pronotum length and width were smaller and the females heavier with cotton seeds with a high oil content. Low-oil cotton genotypes can reduce populations of the stainer bug.

Highlights

Cotton (Gossypium hirsutum L.) is an important crop worldwide (Sharif et al, 2019), whose fibers are used in natural textiles, seed oil for human consumption and biofuels, and cottonseed meal for animal feed (He et al, 2013; Sharif et al, 2019)
The objective of this work was to determine the biological and morphological parameters of Dysdercus maurus fed with cotton (Gossypium hirsutum) seeds with a high or low oil content, as well as to identify genotypes to be used in breeding programs as sources of resistance to this stink bug
The objective of this work was to determine the biological and morphological parameters of D. maurus fed with cotton seeds with a high or low oil content, as well as to identify genotypes to be used in breeding programs as sources of resistance to this stink bug

Summary

Introduction

Cotton (Gossypium hirsutum L.) is an important crop worldwide (Sharif et al, 2019), whose fibers are used in natural textiles, seed oil for human consumption and biofuels, and cottonseed meal for animal feed (He et al, 2013; Sharif et al, 2019). Dysdercus maurus Distant, 1901 (Heteroptera: Pyrrhocoridae) is one of the most competitive species for food resources, with a wide variety of host plants and geographical distribution (Almeida & Gonçalves, 2007). This stinkbug is one of the most destructive cotton pests in Brazil (Jorge & Lomônaco, 2009), causing either direct damage, by destroying cotton boll tissue and mature seeds, making them unviable and wrinkled, with weight loss and reduced oil content, or indirect damage, by the inoculation of opportunistic microorganisms (bacteria and fungi), mainly staining cotton fibers (Salem et al, 2013; Sontakke et al, 2013; Azher et al, 2019)

Objectives

Methods

Results