Fitness costs of reproductive capacity and ovarian development in aBt-resistant strain of the cotton bollwormHelicoverpa armigera(Hübner) (Lepidoptera: Noctuidae)

2014 ◽  
Vol 71 (6) ◽  
pp. 870-877 ◽  
Author(s):  
Wanna Zhang ◽  
Long Ma ◽  
Feng Zhong ◽  
Yanan Wang ◽  
Yuyuan Guo ◽  
...  
Keyword(s):  
Resistant Strain ◽  
Ovarian Development ◽  
Reproductive Capacity ◽  
Fitness Costs ◽  
Lepidoptera Noctuidae

scholarly journals Fitness Costs of Chlorantraniliprole Resistance Related to the SeNPF Overexpression in the Spodoptera exigua (Lepidoptera: Noctuidae)

2021 ◽  
Vol 22 (9) ◽  
pp. 5027
Author(s):  
Changwei Gong ◽  
Xinge Yao ◽  
Qunfang Yang ◽  
Xuegui Wang ◽  
Yuming Zhang ◽  
...  
Keyword(s):  
Insect Pest ◽  
Ryanodine Receptors ◽  
Oviposition Rate ◽  
Fitness Cost ◽  
Fitness Costs ◽  
Male Adult ◽  
Mating Response ◽  
Transmembrane Segments ◽  
High Level ◽  
Lepidoptera Noctuidae

Spodopteraexigua, a multifeeding insect pest, has developed a high level of resistance to chlorantraniliprole, which is a benzoylurea insecticide that targets the ryanodine receptors (RyRs). Herein, the resistant strain (SE-Sel) and sensitive strain (SE-Sus) were obtained by bidirectional screening for six generations. The potential oviposited eggs and oviposition rate of the SE-Sel strain were dramatically lower than those of the SE-Sus strain; on the contrary, the weights of prepupae and preadult were significantly increased. As a post-mating response, the higher number of non-oviposited eggs in the SE-Sel strain was caused by a lower mating rate. In addition, the expression levels of vitellogenin (SeVg) and its receptor (SeVgR) in the SE-Sel strain were consistently lower than those in the SE-Sus strain. An RyRI4743M mutation, contributing to the resistance to chlorantraniliprole, was located in the S3 transmembrane segments and might have affected the release of calcium ions; it led to the upregulated expression of the neuropeptide SeNPF and its receptor SeNPFR, and the mating and oviposition rate were significantly recovered when the SeNPF was knocked down though RNA interference (RNAi) in the male adult of the SE-Sel strain. Moreover, the expression of the juvenile hormone-binding proteins SeJHBWDS3 and SeJHBAN in the male adult of the SE-Sel strain was significantly decreased, which proved the existence of a fitness cost from another angle. Therefore, these results indicate that the fitness cost accompanied by chlorantraniliprole resistance in S. exigua may be related to the decrease in mating desire due to SeNPF overexpression.

scholarly journals Biology and reproductive capacity of Spodoptera eridania (Cramer) (Lepidoptera, Noctuidae) in different soybean cultivars

2015 ◽  
Vol 59 (2) ◽  
pp. 89-95 ◽  
Author(s):  
Bruna Magda Favetti ◽  
Alessandra Regina Butnariu ◽  
Luís Amilton Foerster
Keyword(s):  
Reproductive Capacity ◽  
Spodoptera Eridania ◽  
Soybean Cultivars ◽  
Lepidoptera Noctuidae

Pathogenicity of bacteria isolated from gut of Spodoptera litura (Lepidoptera: Noctuidae) and fitness costs of insect associated with consumption of bacteria

2015 ◽  
Vol 127 ◽  
pp. 38-46 ◽  
Author(s):  
Abhinay Thakur ◽  
Prince Dhammi ◽  
Harvinder Singh Saini ◽  
Sanehdeep Kaur
Keyword(s):  
Spodoptera Litura ◽  
Fitness Costs ◽  
Lepidoptera Noctuidae

Fitness Costs Limit the Development of Resistance to Indoxacarb and Deltamethrin in Heliothis virescens (Lepidoptera: Noctuidae)

2008 ◽  
Vol 101 (6) ◽  
pp. 1927-1933 ◽  
Author(s):  
Ali H. Sayyed ◽  
Munir Ahmad ◽  
Neil Crickmore
Keyword(s):  
Heliothis Virescens ◽  
Fitness Costs ◽  
Development Of Resistance ◽  
Lepidoptera Noctuidae

The Reproductive Capacity of the Larch Sawfly and Some Factors of Concern in its Measurement

1966 ◽  
Vol 98 (6) ◽  
pp. 561-578 ◽  
Author(s):  
R. J. Heron
Keyword(s):  
Egg Production ◽  
Ovarian Development ◽  
Fat Body ◽  
Adult Emergence ◽  
Individual Variability ◽  
Reproductive Capacity ◽  
Appreciable Effect ◽  
Larval Stages ◽  
Larch Sawfly ◽  
The Individual

AbstractOvarian development and egg production in the larch sawfly, Pristiphora erichsonii (Hartig), were studied in the development of a method for measuring reproductive capacity for population studies. Most of the oöcytes are mature at the time of adult emergence but some mature in the following few days. Quantitative differences in foliage consumption during the larval stages have an appreciable effect on egg production but normal environmental temperature differences and exposure to flooding during the spring development period influence ovarian development only to a limited extent.Reproductive capacity can be determined by oöcyte counts of dissected adults of uniform age. The sample size necessary for estimates of various degrees of precision was calculated.Several size measurements have a significant correlation with the numbers of oöcytes produced. The regression of numbers of oöcytes on adult weight is of limited usefulness in the estimation of reproductive capacity. This is largely due to the individual variability in the extent to which fat body tissue is utilized in ovarian development particularly in the case of the larger adults.

scholarly journals Fitness Costs of Two Maize Lepidopteran Pests Fed on Bacillus thuringiensis (Bt) Diets Enriched with Vitamins A and C

Insects ◽  
2021 ◽  
Vol 12 (8) ◽  
pp. 718
Author(s):  
Carmen López ◽  
Pilar Muñoz ◽  
Daniela Zanga ◽  
Patricia Sarai Girón-Calva ◽  
Matilde Eizaguirre
Keyword(s):  
Bacillus Thuringiensis ◽  
Pupal Weight ◽  
Fitness Costs ◽  
Glutathione S Transferase ◽  
Bt Crops ◽  
Bt Toxin ◽  
New Varieties ◽  
High Production ◽  
Lepidoptera Noctuidae ◽  
Β Carotene

Serious malnutrition problems occur in developing countries where people’s diets are mainly based on staple crops. To alleviate this, high-production crops are being developed that are better adapted to climate change, enriched in micronutrients and vitamins, or resistant to pests. In some cases, new varieties have been developed with several of the characteristics mentioned above, such as biofortified and pest-resistant crops. The development of biofortified Bacillus thuringiensis (Bt) crops raises the question of whether vitamin enrichment of Bt crops can in any way favor those pests that are not very susceptible to the Bt toxin that feed on these crops, such as Helicoverpa armigera (Hübner) or Mythimna unipuncta (Haworth) (Lepidoptera: Noctuidae). In this study, the response to a Bt diet enriched with vitamins A (β-carotene) and C (ascorbic acid) was somewhat different between the two species. M. unipuncta was less sensitive to the toxin than H. armigera, although the ingestion of the Bt diet resulted in oxidative stress (longer larval development and lower pupal weight) which was not mitigated by the vitamins. However, the two vitamins reduced the mortality of H. armigera larvae fed on a Bt-enriched diet; in addition, ß-carotene reduced the activity of the antioxidant glutathione S-transferase (GST) of both species, suggesting it has an antioxidant role. The results obtained here indicate that biofortified Bt crops will not favor the development of H. armigera very much and will not affect M. unipuncta’s development at all, although the effect of the increase in vitamins may be very variable and should be studied for each specific phytophagous.

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