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

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.

Development, Survival and Reproduction of Nezara viridula (Hemiptera: Pentatomidae) in Sesame Cultivars and Implications for the Management

“…The higher rate of nymph hatching per N. viridula female fed with mature capsules of the BRS Anahí sesame cultivar confirms its suitability for the reproduction (higher oil content) of this stinkbug [ 36 ]. The lack of nymph hatching with BRS Morena may indicate that this cultivar is a source of resistance to N. viridula may be by antibiosis.…”

“…The longer pre-oviposition and oviposition periods of N. viridula fed with mature sesame capsules, respectively, of the BRS Morena and BRS Anahí may be related to the lower and higher oil content of their seeds. Fat reserves directly affect the energy metabolism of seed-sucking insects, constantly spending energy and needing to feed on seeds with high oil content to accumulate reserves and to survive during periods of food scarcity [ 35 , 36 ].…”

“…The similar longevity between N. viridula males and females fed mature capsules of the three sesame cultivars and longer for both sexes with those of BRS Anahí and BRS Morena may be related to the physiological compensation of this bug, with heavier and lighter individuals, respectively, when fed with dry seeds with low and high lipid contents [ 36 , 38 , 39 ].…”

Morphocultural and pathogenic characterization of Colletotrichum gossypii and Colletotrichum gossypii var. cephalosporioides under different temperatures

“…Cotton is a crop of great importance worldwide (Sharif et al, 2019;Silva et al, 2021). In Brazil, the crop contributes significantly to the national economy (IBGE, 2020).…”