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Showing 1 to 19 of 19 for “"Head-capsule"”.
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The Biosystematics of Isonychia Bicolor (Walker) of the Finley Creek, Missouri
… A single egg mass hatched in 20 days and the head capsule width of the first instar was 0.138 mm. The larval head widths of field samples ranged from 0.364 to 1.976 mm. The size frequency diagrams indicate asynchrony and overlap of generations. Larval dry weight was a highly significant …
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Effects of photoperiod, temperature, and diet on the development of the banded woollybear, Pyrrharctia (Isia) isabella (J. E. Smith) (Lepidoptera: Arctiidae).
… diets and fresh plantain. The times of moulting, head capsule widths, larval and pupal weights, and adult characteristics (fertility, sex) were recorded. Larvae were easily reared on bean, wheat germ, casein-wheat germ and fresh plantain, while casein, alfalfa, and plantain diets proved …
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Responses of rotation-resistant and rotation-susceptible populations of the western corn rootworm to transgenic corn expressing cry toxins and validation of a damage function for corn rootworm larvae
… well as cumulative beetle emergence, sex ratios, head capsule widths, and weights. Densities of western corn rootworm beetles were quite low at many of the sites during this experiment. As a result, consistent trends related to root injury and fitness measurements for beetles were difficult to …
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The reproductive seasonality and flight capability of Sitona discoideus Gyllenhal (Coleoptera: Curculionidae) and its pattern of larval establishment in Canterbury lucerne
… larval populations in most years. Analysis of head capsule widths of both field-collected and laboratory-hatched s. discoideus larvae confirmed that this species possesses five larval instars. Probit analysis allowed for more accurate statistical definition of the head capsule size range of …
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Characterizing the populaton biology and life history of Speyeria adiaste clemencei
… coloration of the dorsal and dorsolateral scoli, head capsule coloration, and coloration of setae, facilitating identification in the field. Adequate access to nectar sources throughout the flight period, especially during drought years, as well as host plant density and distribution, are critical …
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Chionodes mediofuscella (Clemens) (Lepidoptera:Gelechiidae), an indigenous insect infesting the seeds of giant ragweed (Ambrosia trifida L.) (Compositae)
… crescent shaped. Last instar: length 4-9 mm, head capsule .6-.9 mm in width; weights 1.0-12.0 mg. Pupa: length 5.2 mm (females), 4.5-4.6 mm (males); thoracic width 1.2-1.4 mm (females), 1.0-1.1 mm (males); abdominal width 1.4-1.8 mm (females), 1.1-1.4 mm (males). Field collection techniques …
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Bionomics of Epiphyas postvittana, Ctenopseustis obliquana, Planotortrix excessana (Lepidoptera: Tortricidae) and Stathmopoda "skelloni" (Lepidoptera: Stathmopodidae) on apple cv 'Dougherty' in Auckland
… the four species, as found on ‘Dougherty’, using head capsule measurements together with other characters, and keys to the leafroller eggs and pupae are provided. A technique to successfully mate C. obliquana and P. excessana in the laboratory was formulated by predicting the emergence time of …
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Life cycle and host preferences in the Agapanthus borer (Neuranethes spodopterodes)
… have 6 larval instars. The use of the head capsule width as a morphometric parameter and applying it to Dyar's rule gives significant results which allow for adequate determination of the larval instar. The Agapanthus borer has a life cycle that last approximately 84 days. Some species …
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Life cycle and host preferences in the Agapanthus borer (Neuranethes spodopterodes)
… have 6 larval instars. The use of the head capsule width as a morphometric parameter and applying it to Dyar‟s rule gives significant results which allow for adequate determination of the larval instar. The Agapanthus borer has a life cycle that last approximately 84 days. Some species …
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Evaluation of hybridization among three Laricobius species, predators of hemlock woolly adelgid, (Adelgidae)
… among hybrids and pure parental species in the head capsule widths and larval lengths for the first through third instar, and there was evidence of an F2 generation from field collected specimens. Hybrids produced in the lab had intermediate shaped genital paramere angles compared with parental …
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Ecology of the stalk borer Papaipema nebris (Guenee), (Lepidoptera:noctuidae), in the southwestern Virginia no-till corn agroecosystem
… variable numbers of instars before pupation. Head capsule width measurements did not form discrete sets, and overlap occurred between adjacent instars. In feeding preference tests with first instar larvae using either leaf disks or stem sections, higher numbers of larvae fed on grasses, such …
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Molecular Characterization of Hemoglobin Protein in Larvae of 4th Instar Chironomidae for Evaluating Environmental Quality
… were separated by SDS-PAGE and compared to head capsule morphology. Results showed unique profiles for different genera and particular bands that identified species. However, some species had multiple profiles. The source of Hb polymorphisms observed among wild species was investigated by …
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The Mouthparts of Ants
… the largest force output from the available head capsule volume. In general, the entire mandible closer muscle is controlled by 10-12 motor neurons, some of which exclusively supply specific muscle fiber groups. Simultaneous recordings of muscle activity and mandible movement reveal that fast …
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Field-evolved resistance to Cry3Bb1 corn by the western corn rootworm: Investigations of resistance, emergence, node-injury ratings, and fitness
… the LaSalle and Whiteside County sites. Although head capsule widths and adult dry weights fluctuated among treatments at some sites, Bt corn did not have a consistent effect on these fitness measurements which suggests a lack of fitness costs associated with Cry3Bb1 resistance. With the global …
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Transfer and Distribution of Cantharidin within Selected Members of Blister Beetles (Coleoptera: Meloidae) and Its Probable Importance in Sexual Behaviour
… via the opening of cuticular pores. Tracing the head capsule and antennal segments of those Cyaneolytta females which were injected by D2C shows that the marker is found mostly in the two first antennal segments. Similarly, a higher concentration of the cuticular pores was also observed on the …
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Integrated pest management of the banana weevil, Cosmopolites sordidus (Germar), in South Africa
… number of eggs per female were recorded. Larval head capsule widths were measured with an electronic caliper. Ambient temperature and precipitation (rainfall + irrigation) were measured on site. Weevils were active throughout the year and mainly collected in stationary traps, with a collection …