STUDIES ON SOME PLANT BUGS (HEMIPTERA : LYGAIDAE) INFESTING OKRA AND ROSELLE PLANTS
RANIA SAMY SAAD AMAAR;
Abstract
The present study was carried out at the Agricultural Research Station, Sabahia, Alexandria.The initiated objectives of the present investigation included the survay and identification of the pest and predatory- insect species inspected on okra plants, the effect of okra & roselle pods as natural food plants on the biology of the cotton seed bug, the efficiency of some phyto and I or safe chemical compounds against the cotton seed bug and the effect of the tested phyto-oils and chemical insecticides on water content and crude fats in the maturing seeds of okra pods.
The obtained results could be summariezed as follows:
1- Survey of insects and predatorsin okra:
a)The sucking insect- pests on okra plant foliage:
The inspected and identified insect species implied 4 species (A. gosspii, B. tabaci, T
tabaci and E. lybica). The highest recorded number of inspected sucking insects on okra plant during the whole inspection period was that of the cotton Aphid A . gosspii, versus the lowest recorded one of E. lybica, throughout both the consequent seasons of 2006 and
2007.
b) The insect- pests of okra pods:
Three species were inspected at the end of the growing season. Amongest, the cotton
seed bug 0. hyalinipenis has been registered at ratherly high numbers during both the growing seasons of 2006 - 2007, followed by the more lower detected numbers of the
spiny boll worm E. insulana. Whereas the green stink bug N. viridula resembled, the
lowest number of accurring insects on the okra pods .
C) The prevalent predatory insects in okra plantation :
Three inspected and identified predatory insect- species were found and they were belonging to the orders : Diptera, Nearoptera and Coleoptera. The calculated percentage of abundance of the hover fly Syrphus corollae was relatively high. This dipterous predators (S. corollae) was highly abundant (55%& 48%) follwed by the less abundant neuropterous species Chrysopa vulgaris (23% & 27%) , and the coleopterous one Paederus alfieii, (22%& 24%) in the both growing seasons of 2006&2007, respectively.All these predatory insect-species are well known predators that feed on eggs, larvae and adults of their host insects.
2-Effect of two natural food plants (okra & roselle pods) on the biology of the cotton seed bug Oxycarenus hyalinipennis:
-The newly hatched nymphs of the cotton seed bug O.hyalinipennis (Costa) were reared on
soft okra pods, hard okra pods and Roselle pods under the laboratory hygrothermic conditions of27±1°C & 75±5% R.H.
-The results indicated that there were no significant differences between the estimated durations of the raised 2nd nymphal instar on the tested types of food, which amounted to
6.0 ±1.0 day.
The obtained results could be summariezed as follows:
1- Survey of insects and predatorsin okra:
a)The sucking insect- pests on okra plant foliage:
The inspected and identified insect species implied 4 species (A. gosspii, B. tabaci, T
tabaci and E. lybica). The highest recorded number of inspected sucking insects on okra plant during the whole inspection period was that of the cotton Aphid A . gosspii, versus the lowest recorded one of E. lybica, throughout both the consequent seasons of 2006 and
2007.
b) The insect- pests of okra pods:
Three species were inspected at the end of the growing season. Amongest, the cotton
seed bug 0. hyalinipenis has been registered at ratherly high numbers during both the growing seasons of 2006 - 2007, followed by the more lower detected numbers of the
spiny boll worm E. insulana. Whereas the green stink bug N. viridula resembled, the
lowest number of accurring insects on the okra pods .
C) The prevalent predatory insects in okra plantation :
Three inspected and identified predatory insect- species were found and they were belonging to the orders : Diptera, Nearoptera and Coleoptera. The calculated percentage of abundance of the hover fly Syrphus corollae was relatively high. This dipterous predators (S. corollae) was highly abundant (55%& 48%) follwed by the less abundant neuropterous species Chrysopa vulgaris (23% & 27%) , and the coleopterous one Paederus alfieii, (22%& 24%) in the both growing seasons of 2006&2007, respectively.All these predatory insect-species are well known predators that feed on eggs, larvae and adults of their host insects.
2-Effect of two natural food plants (okra & roselle pods) on the biology of the cotton seed bug Oxycarenus hyalinipennis:
-The newly hatched nymphs of the cotton seed bug O.hyalinipennis (Costa) were reared on
soft okra pods, hard okra pods and Roselle pods under the laboratory hygrothermic conditions of27±1°C & 75±5% R.H.
-The results indicated that there were no significant differences between the estimated durations of the raised 2nd nymphal instar on the tested types of food, which amounted to
6.0 ±1.0 day.
Other data
| Title | STUDIES ON SOME PLANT BUGS (HEMIPTERA : LYGAIDAE) INFESTING OKRA AND ROSELLE PLANTS | Other Titles | دراسات على بعض أنواع البق النباتى الذى يصيب نباتات الباميا والكركديه | Authors | RANIA SAMY SAAD AMAAR | Issue Date | 2010 |
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