Toxicological Response of Insect Eggs and Larvae to a Saturated Atmosphere of Chlordimeform

1977 ◽  
Vol 70 (1) ◽  
pp. 57-59 ◽  
Author(s):  
H. P. Streibert ◽  
V. Dittrich
Keyword(s):  
Insect Eggs ◽  
Saturated Atmosphere ◽  
Eggs And Larvae

Modifiable Washing-Flotation Method for Separation of Insect Eggs and Larvae from Soil1

1979 ◽  
Vol 72 (1) ◽  
pp. 67-69 ◽  
Author(s):  
M. E. Montgomery ◽  
G. J. Musick ◽  
J. B. Polivka ◽  
D. G. Nielsen
Keyword(s):  
Insect Eggs ◽  
Flotation Method ◽  
Eggs And Larvae

Versatile Method for Staining Insect Eggs and Larvae in Leaves

1988 ◽  
Vol 81 (1) ◽  
pp. 403-405 ◽  
Author(s):  
Krishna P. N. Moorthy ◽  
M. P. Alexander ◽  
G. C. Tewari
Keyword(s):  
Insect Eggs ◽  
Eggs And Larvae

scholarly journals Biología del Picudo de la guayaba Conotrachelus psidii (Marshall) (Coleoptera: Curculionidae)

2007 ◽  
Vol 7 (2) ◽  
pp. 73 ◽  
Author(s):  
Rafael Augusto Monroy ◽  
Orlando Ildefonso Insuasty
Keyword(s):  
Morphological Changes ◽  
Design Strategies ◽  
Insect Eggs ◽  
Guava Fruit ◽  
Larval Stages ◽  
Light Yellow ◽  
Yellow Color ◽  
Rain Season ◽  
Light Yellow Color ◽  
Eggs And Larvae

<p>El Picudo, <em>Conotrachelus psidii </em>Marshall, desarrolla su estado larvario en el fruto de la guayaba alimentándose de la semilla; el insecto petrifica y madura prematuramente la fruta confiriéndole un aspecto desagradable que causa rechazo en el mercado. En la actualidad causa pérdidas significativas en la agroindustria de la Hoya de Río Suárez. Conocer la duración de los estadios biológicos y sus preferencias de oviposición, permitirá diseñar estrategias de manejo integrado. Los huevos y las larvas se obtuvieron semanalmente de frutos infestados artificialmente para conocer los cambios morfológicos de la cabeza de la larva y la duración del estadio. Cuando las larvas abandonaron el fruto se introdujeron en dispositivos plásticos tubulares saturados con tierra, los cuales se disectaron mensualmente para registrar los estadios de larva, pupa y adulto en el suelo. Se observó que las hembras ovipositaron frutos de 30 a 90 días de edad; los huevos son blanquecinos y con longitud promedio de 1 mm. La larva es ápoda y de color amarillo, con longitudes entre 1,2 y 1,5 mm y entre 10 y 12 mm en las semanas primera y sexta, respectivamente. La pupa es exarata, amarilla clara y de 7,5 mm de longitud. El adulto es café oscuro y tiene 6 mm de largo. El ciclo total duró 199 días distribuido así: huevo, 4 a 7 días; larva en el fruto, 42 a 56 días; larva en suelo, 90 días; pupa, 30 a 60 días. Los adultos emergieron entre 20 y 30 días en la época lluviosa y en laboratorio sobrevivieron hasta 435 días después de su emergencia.</p><p> </p><p><strong>Biology of the guaba weevil <em>Conotrachelus psidii </em>(Marshall) (Coleoptera: Curculionidae)</strong></p><p>The weevil <em>Conotrachelus psidii </em>(Marshall) develops its larval stages inside the guava fruit feeding on its seeds, and petrifying and prematurely ripening the fruit, developing an unpleasant appearance, rejected by the market. To design strategies for biological control, its necessary to determine the length of the different biological phases of the insect. Eggs and larvae were obtained every week from semi-artificially infected fruits to determine larva’s head morphological changes. Once larvae abandoned the fruit, they were transferred to 6 “ diameter plastic tubes filled with soil and dissected monthly to register the different life stages of larvae, pupae and adults. Oviposition preferences were observed in 30 to 90 days old guavas. Eggs are whitish and measured on average 1mm of length. Larvae are apoda and yellow, ranging in length from 1.2 to 1.5 mm and from 10 to 12 mm in the first and sixth week respectively. Pupae have exharate shape, of light yellow color with an average of 7.5 mm length. Adults are dark brown and 6 mm in length. The total cycle lasted 199 days distributed as follow: egg, 4 to 7 days; larva in the fruit, 42 to 56 days; larva in soil, 90 days and pupa stage from 30 to 60 days. Adults emerged from 20 to 30 days during the rain season and survive up to 435 days under laboratory conditions.</p><p> </p>

Recent demonstration of helminth eggs and larvae from vegetable cultivating soil

1982 ◽  
Vol 20 (2) ◽  
pp. 83 ◽  
Author(s):  
Dong Wik Choi ◽  
Mee Sun Ock ◽  
Jong Woo Suh
Keyword(s):  
Helminth Eggs ◽  
Eggs And Larvae ◽  
Recent Demonstration

CURRENT STATE AND DEVELOPMENT PERSPECTIVES OF THE CASPIAN SPRAT FISHERIES

2018 ◽  
pp. 69-75
Author(s):  
Tatiana Vasilievna Pomogaeva ◽  
Aliya Ahmetovna Aseinova ◽  
Yuriy Aleksandrovich Paritskiy ◽  
Vjacheslav Petrovich Razinkov
Keyword(s):  
Food Item ◽  
Growth Potential ◽  
North West ◽  
Marine Fishery ◽  
The North ◽  
Current State ◽  
West Part ◽  
Eggs And Larvae ◽  
Intensive Growth

The article presents annual statistical data of the Caspian Research Institute of Fishery. There has been kept track of the long term dynamics of the stocks of three species of Caspian sprat (anchovy, big-eyed kilka, sprat) and investigated a process of substituting a food item of sprats Eurytemora grimmi to a small-celled copepod species Acartia tonsa Dana. According to the research results, there has been determined growth potential of stocks of each species. Ctenophoran-Mnemiopsis has an adverse effect on sprat population by eating fish eggs and larvae. Ctenophoram - Mnemiopsis is a nutritional competitor to the full-grown fishes. The article gives recommendations on reclamation of stocks of the most perspective species - common sprat, whose biological characteristics helped not to suffer during Ctenophoram outburst and to increase its population during change of the main food item. Hydroacoustic survey data prove the intensive growth of common sprat biomass in the north-west part of the Middle Caspian. According to the results of the research it may be concluded that to realize the volumes of recommended sprat catch it is necessary to organize the marine fishery of common sprat at the Russian Middle Caspian shelf.

Chordata: Fish eggs and larvae

2017 ◽  
Author(s):  
Peter Munk ◽  
Jørgen G. Nielsen
Keyword(s):  
Life Cycle ◽  
Tree Of Life ◽  
Fish Eggs ◽  
General Morphology ◽  
Family Level ◽  
Eggs And Larvae ◽  
Fish Eggs And Larvae

This chapter describes the taxonomy of fish eggs and larvae. Most fish eggs and larvae are planktonic, and are commonly found in plankton net tows. Collectively these fish stages are referred to as ichthyoplankton. The chapter covers their life cycle, ecology, and general morphology. It includes a section that indicates the systematic placement of the taxon described within the tree of life, and lists the key marine representative illustrated in the chapter (usually to genus or family level). This section also provides information on the taxonomic authorities responsible for the classification adopted, recent changes which might have occurred, and lists relevant taxonomic sources.

scholarly journals The formation of a hatching line in the serosal cuticle confers multifaceted adaptive functions on the eggshell of a cicada

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Minoru Moriyama ◽  
Kouji Yasuyama ◽  
Hideharu Numata
Keyword(s):  
Protective Role ◽  
Terminal Phase ◽  
Embryonic Diapause ◽  
Insect Eggs ◽  
Ridge Structure ◽  
Conflicting Demands ◽  
Partial Degradation ◽  
Egg Period ◽  
Eggshell Structure

AbstractInsect eggshells must meet various demands of developing embryos. These demands sometimes conflict with each other; therefore, there are tradeoffs between eggshell properties, such as robustness and permeability. To meet these conflicting demands, particular eggshell structures have evolved in diverse insect species. Here, we report a rare eggshell structure found in the eggshell of a cicada, Cryptotympana facialis. This species has a prolonged egg period with embryonic diapause and a trait of humidity-inducible hatching, which would impose severe demands on the eggshell. We found that in eggs of this species, unlike many other insect eggs, a dedicated cleavage site, known as a hatching line, was formed not in the chorion but in the serosal cuticle. The hatching line was composed of a fine furrow accompanied by ridges on both sides. This furrow-ridge structure formed in the terminal phase of embryogenesis through the partial degradation of an initially thick and nearly flat cuticle layer. We showed that the permeability of the eggshell was low in the diapause stage, when the cuticle was thick, and increased with degradation of the serosal cuticle. We also demonstrated that the force required to cleave the eggshell was reduced after the formation of the hatching line. These results suggest that the establishment of the hatching line on the serosal cuticle enables flexible modification of eggshell properties during embryogenesis, and we predict that it is an adaptation to maximize the protective role of the shell during the long egg period while reducing the barrier to emerging nymphs at the time of hatching.

scholarly journals Isolation, characterization, and amino acid sequence of a ubiquitin-like protein from insect eggs.

1982 ◽  
Vol 257 (17) ◽  
pp. 10267-10270
Author(s):  
J G Gavilanes ◽  
G Gonzalez de Buitrago ◽  
R Perez-Castells ◽  
R Rodriguez
Keyword(s):  
Amino Acid ◽  
Amino Acid Sequence ◽  
Insect Eggs
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