Temporal molt inhibition by anti-ecdysone serum injected into lepidopteran larvae

1991 ◽  
Vol 18 (4) ◽  
pp. 195-201 ◽  
Author(s):  
Heiner Birkenbeil ◽  
Manfred Eckert
Keyword(s):  
Lepidopteran Larvae

scholarly journals Insecticidal and Microbial Control of Lepidopteran Larvae in Minnesota Cabbage, 1993

1994 ◽  
Vol 19 (1) ◽  
pp. 64-64
Author(s):  
D. W. Battels ◽  
P. C. Bolin ◽  
W. D. Hutchison
Keyword(s):  
Microbial Control ◽  
Lepidopteran Larvae

scholarly journals Germination, Establishment, and Mortality of Naturally Seeded Southwestern Ponderosa Pine

2003 ◽  
Vol 18 (2) ◽  
pp. 109-114 ◽  
Author(s):  
Steven J. Stein ◽  
Diana N. Kimberling
Keyword(s):  
Pinus Ponderosa ◽  
Ponderosa Pine ◽  
Mineral Soil ◽  
Mortality Data ◽  
Mortality Factors ◽  
Seedling Mortality ◽  
Prescribed Burns ◽  
Factors Affecting ◽  
Northern Arizona ◽  
Lepidopteran Larvae

Abstract Information on the mortality factors affecting naturally seeded conifer seedlings is becoming increasingly important to forest managers for both economic and ecological reasons. Mortality factors affecting ponderosa pine (Pinus ponderosa) seedlings immediately following natural germination and through the following year were monitored in Northern Arizona. The four major mortality factors in temporal order included the failure of roots to establish in the soil (27%), herbivory by lepidopteran larvae (28%), desiccation (30%), and winterkill (10%). These mortality factors were compared among seedlings germinating in three different overstory densities and an experimental water treatment. Seedlings that were experimentally watered experienced greater mortality than natural seedlings due to herbivory (40%), nearly as much mortality due to the failure of roots to establish in the soil (20%), less mortality due to winterkill (5%), and no mortality due to desiccation. The seedling mortality data through time were summarized using survivorship curves and life tables. Our results suggest that managers should consider using prescribed burns to decrease the percentage of seedlings that die from failure of their roots to reach mineral soil and from attack by lepidopteran larvae. West. J. Appl. For. 18(2):109–114.

scholarly journals Apomictic parthenogenesis in a parasitoid waspMeteorus pulchricornis, uncommon in the haplodiploid order Hymenoptera

2014 ◽  
Vol 104 (3) ◽  
pp. 307-313 ◽  
Author(s):  
Y. Tsutsui ◽  
K. Maeto ◽  
K. Hamaguchi ◽  
Y. Isaki ◽  
Y. Takami ◽  
...  
Keyword(s):  
Parasitoid Wasp ◽  
Parasitoid Wasps ◽  
Genetic Studies ◽  
Insect Order ◽  
Egg Maturation ◽  
Polar Bodies ◽  
Lepidopteran Larvae ◽  
Apomictic Parthenogenesis ◽  
Meteorus Pulchricornis ◽  
New Type

AbstractAlthough apomixis is the most common form of parthenogenesis in diplodiploid arthropods, it is uncommon in the haplodiploid insect order Hymenoptera. We found a new type of spontaneous apomixis in the Hymenoptera, completely lacking meiosis and the expulsion of polar bodies in egg maturation division, on the thelytokous strain of a parasitoid waspMeteorus pulchricornis(Wesmael) (Braconidae, Euphorinae) on pest lepidopteran larvaeSpodoptera litura(Fabricius) (Noctuidae). The absence of the meiotic process was consistent with a non-segregation pattern in the offspring of heterozygous females, and no positive evidence was obtained for the induction of thelytoky by any bacterial symbionts. We discuss the conditions that enable the occurrence of such rare cases of apomictic thelytoky in the Hymenoptera, suggesting the significance of fixed heterosis caused by hybridization or polyploidization, symbiosis with bacterial agents, and occasional sex. Our finding will encourage further genetic studies on parasitoid wasps to use asexual lines more wisely for biological control.

Juvenile hormone-like effects of a thiazolylurea on lepidopteran larvae

1989 ◽  
Vol 12 (2) ◽  
pp. 79-88 ◽  
Author(s):  
Marcia J. Loeb ◽  
Albert B. DeMilo ◽  
Grace Jones ◽  
Davey Jones
Keyword(s):  
Juvenile Hormone ◽  
Lepidopteran Larvae

scholarly journals Comparison of Silks from Pseudoips prasinana and Bombyx mori Shows Molecular Convergence in Fibroin Heavy Chains but Large Differences in Other Silk Components

2021 ◽  
Vol 22 (15) ◽  
pp. 8246
Author(s):  
Michal Rindos ◽  
Lucie Kucerova ◽  
Lenka Rouhova ◽  
Hana Sehadova ◽  
Michal Sery ◽  
...  
Keyword(s):  
Bombyx Mori ◽  
Silk Gland ◽  
Amino Acid Sequences ◽  
Phylogenetic Distance ◽  
Rna Seq ◽  
Chain Molecules ◽  
Heavy Chains ◽  
Lepidopteran Larvae ◽  
Crystalline Domains

Many lepidopteran larvae produce silk feeding shelters and cocoons to protect themselves and the developing pupa. As caterpillars evolved, the quality of the silk, shape of the cocoon, and techniques in forming and leaving the cocoon underwent a number of changes. The silk of Pseudoips prasinana has previously been studied using X-ray analysis and classified in the same category as that of Bombyx mori, suggesting that silks of both species have similar properties despite their considerable phylogenetic distance. In the present study, we examined P. prasinana silk using ‘omics’ technology, including silk gland RNA sequencing (RNA-seq) and a mass spectrometry-based proteomic analysis of cocoon proteins. We found that although the central repetitive amino acid sequences encoding crystalline domains of fibroin heavy chain molecules are almost identical in both species, the resulting fibers exhibit quite different mechanical properties. Our results suggest that these differences are most probably due to the higher content of fibrohexamerin and fibrohexamerin-like molecules in P. prasinana silk. Furthermore, we show that whilst P. prasinana cocoons are predominantly made of silk similar to that of other Lepidoptera, they also contain a second, minor silk type, which is present only at the escape valve.

Screening and characterization of lipase producing bacteria isolated from the gut of a lepidopteran larvae, Samia ricini

2021 ◽  
pp. 101856
Author(s):  
Kondwani MsangoSoko ◽  
Sakshi Gandotra ◽  
Ramcharan Bhattacharya ◽  
Balasubramanian Ramakrishnan ◽  
Kirti Sharma ◽  
...  
Keyword(s):  
Lepidopteran Larvae
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