Pigment migration in the eye of myndus crudus homoptera cixiidae and its relationship to day and night activity.

When the compound eye of the adult of the planthopper, Myndus crudus, is light-adapted, pigments are condensed in a zone proximal to the crystalline cones and straw-colored. When dark-adapted, pigments migrate distally into the region of the crystalline cones and thus are closer to the cuticle. Viewed externally, the dark-adapted eye is maroon-colored. The eyes of most adult M. crudus observed during daylight hours were light-adapted. Eyes of males and females changed from the light to the dark-adapted condition between sunset and 1/2 hr after sunset. When planthoppers with light-adapted eyes were placed abruptly into darkness at a temperature of 25 -27 C, the eyes became dark-adapted within 15-30 min. When planthoppers with dark-adapted eyes were placed abruptly into light, the eyes became light-adapted within 30-60 min. At 8C the planthoppers were inmobile, and light-adapted eyes had not changed to the dark-adapted condition within 45 min. Eyes of M. crudus nymphs, which live in the root zones of grasses, are dark red and do not change color in response to changes in light. Field samples showed tht adult M. crudus were active in coconut palms during the day and night, but higher numbers were caught during the day (P 0.01)

Bibliographic Details

Main Author:	Howard, F. W. 46963, autor. aut
Format:	Texto biblioteca
Language:	English
Published:	1981 : [Publisher not identified]
Subjects:	Amarillamiento letal, Enfermedades de las plantas., insectos vectores, Myndus crudus., Palma de aceite,
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