scholarly journals Αn assessment of components of crop loss due to infestation by Dacus oleae, in Corfu

2017 ◽  
Vol 1 ◽  
pp. 7 ◽  
Author(s):  
Ε.Τ. Kapatos ◽  
B.S. Fletcher
Keyword(s):  
Small Proportion ◽  
Stage Larva ◽  
Crop Loss ◽  
Fruit Pulp ◽  
Dacus Oleae ◽  
The Third ◽  
Fruit Drop ◽  
Olive Fly ◽  
Third Stage

An assessment of components of crop loss caused by the olive fly, Dacus oleae, was carried out in Corfu during the years 1976-1979. The results indicate that the most important component of crop loss due to D. oleae infestation is the preharvest fruit drop induced, mainly, by the third stage larva. Using three starting dates, which coincided with the main periods of infestation between July and October, estimates were made of the proportions of infested fruits induced to fall prematurely before the start of harvesting in November. The larva of D. oleae consumes only a small proportion of the fruit pulp (on average 4.48 %). The effect of infestation on the acidity of the oil is indirect and it is important only when the fruits remain for over a week on the ground before they are collected. Compensation by the tree for premature fruit drop caused by D. oleae infestation does not appear to be of any significance in assessing crop loss.

Studies on the life-history of Bunostomum phlebotomum (Railliet, 1900), a hookworm parasite of cattle

Parasitology ◽  
1946 ◽  
Vol 37 (3-4) ◽  
pp. 192-201 ◽  
Author(s):  
J. F. A. Sprent
Keyword(s):  
Infective Larva ◽  
Stage Larva ◽  
Fourth Stage ◽  
Larval Stages ◽  
The Third ◽  
Third Stage ◽  
History Of ◽  
Time Required ◽  
Cutaneous Blood ◽  
Fourth Stage Larva

A description is given of the processes of copulation, formation of the egg and spermatozoon, cleavage, embryogeny and hatching in B. phlebotomum. These processes were found to be essentially similar to those in other strongyle nematodes.The anatomy of the first three larval stages is described and the observations of Conradi & Barnette (1908) and Schwartz (1924) were largely confirmed.Penetration of the skin of calves by the infective larva was observed histologically. The larvae were found to have reached the dermis within 30 min. and to have penetrated the cutaneous blood vessels within 60 min. of application to the skin. The larvae were found in the lung where the third ecdysis was in progress 10 days after penetration of the skin. A description is given of the growth of the third-stage larva in the lung, the changes which take place during the third ecdysis, and the anatomy of the fourth-stage larva.The fourth-stage larvae exsheath in the lungs and travel to the intestine. After a period of growth in which sexual differentiation takes place, the fourth ecdysis occurs and the adult parasite emerges. The time required for the attainment of maturity was found to be somewhere between 30 and 56 days after penetration of the skin.This paper was written at the Ministry of Agriculture and Fisheries Veterinary Laboratories, Wey-bridge, and the writer would like to express his gratitude to the Director, Prof. T. Dalling, also to Dr W. R. Wooldridge, chairman of the Council of the Veterinary Educational Trust for their help and encouragement. The writer's thanks are also due to Dr H. A. Baylis, Prof. R. T. Leiper and Dr E. L. Taylor for their advice and help on technical points, and to Mr R. A. O. Shonekan, African laboratory assistant, for his able co-operation.

New information about the third stage larva and larval habitat of Microdon (Chymophila) bruchi Shannon, 1927 (Diptera, Syrphidae) from Argentina

2019 ◽  
Vol 53 (45-46) ◽  
pp. 2833-2853
Author(s):  
Guillermo P. López-García ◽  
Menno Reemer ◽  
Guillermo Debandi ◽  
Ximo Mengual
Keyword(s):  
Larval Habitat ◽  
Stage Larva ◽  
The Third ◽  
New Information ◽  
Third Stage

Description of the larva of Chalcosoma atlas (L.) (Coleoptera, Scarabaeidae, Dynastinae) from Malaysia

1976 ◽  
Vol 66 (2) ◽  
pp. 189-193 ◽  
Author(s):  
G. O. Bedford
Keyword(s):  
Stage Larva ◽  
Breeding Sites ◽  
Oryctes Rhinoceros ◽  
The Third ◽  
Third Stage

AbstractThe third-stage larva of Chalcosoma atlas (L.) collected in Malaysia is described, with illustrations, and a key is provided to distinguish larvae of this species from those of Oryctes rhinoceros (L.) and Xylotrupes gideon beckeri Schaufuss, all of which occur in similar breeding sites.

scholarly journals Gnathostomiasis - A Rare Nematode Infection

1970 ◽  
Vol 16 (1) ◽  
pp. 28-29
Author(s):  
MM Rahman
Keyword(s):  
Anterior Chamber ◽  
Adult Stage ◽  
Skin Penetration ◽  
Human Infection ◽  
Stage Larva ◽  
Larval Form ◽  
The Third ◽  
Northern District ◽  
Third Stage ◽  
Raw Fish

Gnathostoma, primarily an animal nematode, is rusty in colour, 2-3 cm long in adult stage, caninfect man by their larval form. Human infection occurs by the third stage larva by consumptionof undercooked or raw fish, poultry, or pork and rarely by skin penetration, In Bangladeshgnathostomiasis is not reported. But recently a female of 38 year of age of the northern district,Rangpur has got infected with a species of Gnathostoma, manifested by the appearance of thefarva in anterior chamber of her right eye. The larva was removed from her eye surgically inliving state and the patient was cured.doi: 10.3329/taj.v16i1.3900TAJ June 2003; Vol.16(1): 28-29

The systematic position of the genus Helicobosca Bezzi with a discussion of the monophyly of the calyptrate families Calliphoridae, Rhinophoridae, Sarcophagidae and Tachinidae (Diptera)

1986 ◽  
Vol 17 (1) ◽  
pp. 75-92 ◽  
Author(s):  
Knut Rognes
Keyword(s):  
Systematic Position ◽  
Stage Larva ◽  
Current Position ◽  
The Third ◽  
Third Stage ◽  
Western Palaearctic ◽  
First Time

AbstractThe Western Palaearctic genus Helicobosca Bezzi, 1906 is described in detail and its systematic position discussed. The monophyly of the calyptrate families Tachinidae, Rhinophoridae, Sarcophagidae and Calliphoridae is reviewed. Helicobosca is removed from its current position within the subfamily Paramacronychiinae of the Sarcophagidae and transferred to the Calliphoridae, where a new subfamily Helicoboscinae Verves, 1980, stat.n., is erected for its reception. The third stage larva of H. palpalis (Robineau-Desvoidy) is described for the first time.

Development to third-stage larvae occurs in the eggs of Anisakis simplex and Pseudotetranova decipiens (Nematoda, Ascaridoidea, Anisakidae)

1995 ◽  
Vol 52 (S1) ◽  
pp. 134-139 ◽  
Author(s):  
Marianne Køie ◽  
Bjørn Berland ◽  
Michäel D.B. Burt
Keyword(s):  
North Atlantic ◽  
Sea Water ◽  
Anisakis Simplex ◽  
Stage Larva ◽  
Second Stage ◽  
The Third ◽  
The North ◽  
Pseudoterranova Decipiens ◽  
Third Stage ◽  
Tail Tip

Two moults occur during larval development in the eggs of Anisakis simplex (Rudolphi, 1809) and Pseudoterranova decipiens (Krabbe, 1878) from the North Atlantic. Live larvae forced out of eggs in sea water by coverslip pressure shortly before spontaneous hatching were surrounded by the thin cuticle of the first-stage larva. Infective larvae from naturally hatched eggs are loosely ensheathed in the thick cuticle of the second-stage larva. Thus, it is the third-stage larva that emerges from the egg of both species and not the second-stage larva as previously believed. The thin, smooth, fragile cuticle of the first-stage larva remains in the egg. The striated, cocoon-like cuticle of the second-stage larva of A. simplex may increase the buoyancy of the third-stage larva. The tail tip of the cuticle of the second-stage larva of P. decipiens is sticky and adheres the sheathed third-stage larva to the substrate.

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