The Effects of Lichen Extracts on Feeding by Gypsy Moths (Lymantria dispar)

1990 ◽  
Vol 93 (2) ◽  
pp. 220 ◽  
Author(s):  
Maria Rose Blewitt ◽  
Gillian A. Cooper-Driver
Keyword(s):  
Lymantria Dispar ◽  
Gypsy Moths

Sperm Transfer in Gypsy Moths: Effect of Constant or Cyclic Temperature and Constant Light or Darkness during the Pupal Stage

1997 ◽  
Vol 32 (3) ◽  
pp. 321-331 ◽  
Author(s):  
F. I. Proshold
Keyword(s):  
Light Intensity ◽  
Constant Temperature ◽  
Lymantria Dispar ◽  
Pupal Stage ◽  
Sperm Transfer ◽  
Constant Light ◽  
Constant Darkness ◽  
Gypsy Moths ◽  
Cyclic Temperature ◽  
Full Complement

Sperm transfer and fertility of the gypsy moth, Lymantria dispar (L.), held as pupae under constant temperature and 24-h light, 24-h darkness, or a photoperiod of 16:8 (L:D) h were compared with males held in cyclic temperature and 24-h light, 24-h darkness, or a photoperiod of 16:8 (L:D) h. Constant temperature and constant light or darkness severely reduced its ability to transfer sperm. Males held under constant light were more severely affected than males held in darkness, but sperm transfer was not correlated with light intensity (between 80 and 3960 lux). Nearly all males held under constant light and most held under constant darkness were sterile or partially sterile. In either case, sterility was caused by poor sperm transfer. Females with a full complement of sperm were fertile regardless of holding condition of male pupae. The sterilizing effect of constant light or darkness was overridden by cyclic temperature of 28°C for 16 h and 22°C for 8 h. At a photoperiod of 16:8 h, pupae held in constant 28°C transferred less sperm than those held at 25°C. Pupae held at constant 30°C were sterile, but those held at 30°C for 16 h and 25°C for 8 h transferred similar quantities of sperm as males held at constant 28°C.

CAUSES AND ECOLOGICAL IMPLICATIONS OF EGG RETENTION IN THE GYPSY MOTH, LYMANTRIA DISPAR (L.) (LEPIDOPTERA: LYMANTRIIDAE).

1987 ◽  
Vol 119 (9) ◽  
pp. 765-771 ◽  
Author(s):  
Pedro Barbosa ◽  
Peter Martinat
Keyword(s):  
Gypsy Moth ◽  
Lymantria Dispar ◽  
Egg Production ◽  
Pupal Development ◽  
Egg Retention ◽  
Gypsy Moths ◽  
Ecological Implications ◽  
Pupal Size ◽  
Food Consumed

AbstractThe role of starvation, the occurrence of mating, and delays and the onset of mating on the retention of eggs by the gypsy moth, Lymantria dispar (L.), were evaluated. The mating status of female gypsy moths did influence egg retention.Mating delays did not affect egg retention. Differences in the number of females retaining some eggs were found among females whose larvae had been reared on different host plants. The amount of food consumed had a significant effect on egg retention. Partial starvation had an impact on egg retention and on larval and pupal development, pupal size, and total egg production. The greater the starvation the greater the egg retention. The ecological implications of these results are discussed.

Effects of Spined Soldier Bug (Hemiptera Pentatomidae) Augmentation and Sticky Barrier Bands on Gypsy Moth (Lepidoptera: Lymantriidae) Density in Oak Canopies2

1994 ◽  
Vol 29 (3) ◽  
pp. 339-346 ◽  
Author(s):  
Kevin W. Thorpe ◽  
Ralph E. Webb ◽  
Jeffrey R. Aldrich ◽  
Kathy M. Tatman
Keyword(s):  
Gypsy Moth ◽  
Lymantria Dispar ◽  
Larval Density ◽  
Podisus Maculiventris ◽  
Egg Masses ◽  
Oak Trees ◽  
Gypsy Moths ◽  
Spined Soldier Bug ◽  
Augmentative Releases

The effects of sticky barrier bands, augmentative releases of the spined soldier bug, Podisus maculiventris (Say), and the deployment of P. maculiventris pheromone on gypsy moth, Lymantria dispar (L.), larval density in the canopy of oak trees were tested. Sticky barrier bands used alone reduced larval gypsy moth density by ≈35%. The release of 5,810 P. maculiventris nymphs per tree or the deployment of P. maculiventris pheromone to trees on which sticky barrier bands had been applied had no additional effect on gypsy moth larval density. None of the treatments affected the number of gypsy moth egg masses produced. Significantly more P. maculiventris adults were observed on trees with the pheromone, but higher numbers of nymphs were not subsequently observed on these trees. Counts of gypsy moths beneath burlap bands prior to gypsy moth pupation were about four times higher on unbanded than on banded trees, but counts of pupae beneath burlap bands did not differ between treatments.

Host Tree Influences on the Dispersal of Late Instar Gypsy Moths, Lymantria Dispar

Oikos ◽  
1982 ◽  
Vol 38 (1) ◽  
pp. 1 ◽  
Author(s):  
David Lance ◽  
Pedro Barbosa
Keyword(s):  
Lymantria Dispar ◽  
Host Tree ◽  
Gypsy Moths ◽  
Late Instar

Modeled global invasive potential of Asian gypsy moths, Lymantria dispar

2007 ◽  
Vol 125 (1) ◽  
pp. 39-44 ◽  
Author(s):  
A. Townsend Peterson ◽  
Richard Williams ◽  
Guojun Chen
Keyword(s):  
Lymantria Dispar ◽  
Invasive Potential ◽  
Gypsy Moths
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