scholarly journals Namnožitev molja macesnovih iglic (Coleophora laricella) v KE Litija

2011 ◽  
Author(s):  
Maja Jurc ◽  
Dušan Jurc ◽  
Jože Horvat ◽  
Matej Zupančič ◽  
Marija Kolšek ◽  
...  
Keyword(s):  
Coleophora Laricella

NOTES ON MATING BEHAVIOR AND OVIPOSITION OF CHRYSOCHARIS LARICINELLAE (HYMENOPTERA: EULOPHIDAE), A PARASITE OF THE LARCH CASEBEARER (COLEOPHORA LARICELLA)

1967 ◽  
Vol 99 (3) ◽  
pp. 326-331 ◽  
Author(s):  
F. W. Quednau
Keyword(s):  
Mating Behavior ◽  
Fourth Instar ◽  
Egg Laying ◽  
Feeding Pattern ◽  
Host Feeding ◽  
Chemical Surface ◽  
Coleophora Laricella ◽  
Host Mortality

AbstractChrysocharis laricinellae (Ratz.) mated readily in the laboratory when several individuals of both sexes were held together in a vial. The courtship dance performed by the male is described. Parasite females develop mature eggs 3 days after emergence and are apparently capable of resorbing the eggs if hosts are not available, and to produce new ones after host-feeding. Storage of eggs in the ovary for 5 months at 55°F and sterility (phasic castration) of certain individuals is reported. Longevity of egg-laying females at 75°F was about 1 month less than that of parasites that had been denied contact with hosts. Odor apparently plays little or no role in the location of the larch casebearer larvae by C. laricinellae, but chemical surface stimuli seem to exist on the surface of a mine or case of Coleophora laricella (Hbn.). The parasite is also stimulated by vibrations of the host in its case. The oviposition and host-feeding pattern of C. laricinellae is described. Host-feeding on fourth-instar larvae of the larch casebearer contributed little to host mortality.

scholarly journals The Effects of Defoliation by the Larch Casebearer on the Radial Growth of Tamarack

1988 ◽  
Vol 64 (3) ◽  
pp. 190-192 ◽  
Author(s):  
Paul Benoit ◽  
Robert Blais
Keyword(s):  
Key Words ◽  
Radial Growth ◽  
The Other ◽  
Larix Laricina ◽  
Increment Core ◽  
Core Samples ◽  
Coleophora Laricella

Tamarack (Larix laricina [DuRoi] K. Koch) was severely defoliated by the larch casebearer (Coleophora laricella) in most areas of Quebec during 1979 and 1980. Increment core samples were taken in late September 1982 from 20 tamaracks in each of two stands to determine the effect of defoliation on radial growth. In one stand, the trees were 80% defoliated in 1980 and during this year radial growth was reduced by 52%. Growth returned to predefoliation level the following year when the trees were not defoliated. In the other stand, trees were 60% defoliated in 1979 and 70% in 1980. During these years, radial growth was reduced by 48 and 70% respectively. Growth in this stand had not fully returned to predefoliation level two years after the collapse of the infestation. In both stands, variations in defoliation among trees did not exceed 10% of the average. Key Words: Coleophora laricella, larch casebearer, tamarack, larch, defoliation.

EVIDENCE FOR MORTALITY IN ADDITION TO SUCCESSFUL PARASITISM OF NEEDLEMINING LARCH CASEBEARER (LEPIDOPTERA: COLEOPHORIDAE) LARVAE BY AGATHIS PUMILA (RATZ.) (HYMENOPTERA: BRACONIDAE)

1988 ◽  
Vol 120 (11) ◽  
pp. 1035-1036
Author(s):  
R.B. Ryan
Keyword(s):  
North America ◽  
Biological Agents ◽  
Dependent Manner ◽  
Western North America ◽  
Partial Explanation ◽  
Density Dependent ◽  
Coleophora Laricella ◽  
Insect Parasites

In an attempt to control the larch casebearer, Coleophora laricella (Hübner), in western North America with biological agents, insect parasites from Europe and Japan were introduced (Denton 1972, 1979; Ryan et al. 1987). The braconid Agathis pumila (Ratz.) has become widely established and apparently has been responsible for markedly reduced casebearer densities (Ryan 1983, 1986; Ryan et al. 1987). Parasitization by it in many research plots reached 80-95% (unpublished data), then declined following reductions in the casebearer populations in a typically delayed density-dependent manner. I present here a partial explanation for why casebearer densities declined so drastically, to levels even lower than could perhaps be explained by parasitization at such high levels.

NOTES ON MATING, OVIPOSITION, ADULT LONGEVITY, AND INCUBATION PERIOD OF EGGS OF THE LARCH CASEBEARER, COLEOPHORA LARICELLA (LEPIDOPTERA: COLEOPHORIDAE), IN THE LABORATORY

1967 ◽  
Vol 99 (4) ◽  
pp. 397-401 ◽  
Author(s):  
F. W. Quednau
Keyword(s):  
Light Intensity ◽  
Incubation Period ◽  
Room Temperature ◽  
Egg Laying ◽  
Adult Longevity ◽  
Optimum Temperature ◽  
Coleophora Laricella ◽  
Average Longevity

AbstractMating in Coleophora laricella (Hbn.) took place 1 or 2 days after emergence and was stimulated by decreasing light intensity ranging from 3000 ft-c to 200 ft-c within 2 hours. The female is pro-ovigenic, with peak opposition during the first week. Optimum temperature for egg laying was 70 to 80°F; the average number of eggs deposited was about 66; average longevity of female adults was about 10 days at room temperature, but considerably longer at lower temperatures. A few eggs were laid at 50° and 95°F. Incubation period of the eggs was 12 days at 80° to 85°F and 40 days at 55°F. Hatching of eggs did not occur above 85°F or below 55 °F.

Notes on the Natural Control of Coleophora laricella, the Larch Case-bearer

1933 ◽  
Vol 24 (2) ◽  
pp. 271-291 ◽  
Author(s):  
W. H. Thorpe
Keyword(s):  
Preliminary Report ◽  
Natural Control ◽  
Important Species ◽  
Internal Parasite ◽  
Coleophora Laricella ◽  
Imperial Institute

This paper consists of a preliminary report on investigations of the parasites of Coleophora laricella in Europe, with a view to their possible utilisation in Canada.Systematic and biological notes on the more important species are given.The most promising parasite, Angitia nana, has already been shipped to Canada. It is a solitary internal parasite of the case-bearer larva. Further investigations are necessary before it can be considered safe to introduce any other species.I am very grateful to Dr. C. Ferrière, of the Imperial Institute of Entomology, for the time and trouble he has given to the work of identifying the parasite material. The late Mr. J. C. Robbins helped materially by kindly carrying on observations while I was absent through illness, and by collecting material in the field. Mr. R. J. Spittle has been of great assistance in the production of the finished drawings, several of them being mainly his own work. A number of the earlier field collections were made by Mr. H. S. Hanson.

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