Effect of planting dates and spaces on certain pests infesting three medical and aromatic plants

Abstract: Three aromatic and medical plants ,i.e. guar, roselle and peppermint were planted under different planting dates and spaces during two successive growing seasons at Gemmeza region, Gharbia Governorate . The obtained results clearly revealed that the tested planting dates had highly significant differences between average numbers of Aphis gossypii Glover, Empoasca lybica de Berg, Thrips tabaci Lind., Bemisia tabaci(Genn.) and Tetranychus spp. during the two successive growing seasons of 1994 and 1995, except in case of E. lybica which showed significant effect in 1994 season and insignificant in 1995. The abundance level of Tetranychus spp. responded significantly and high significantly according to tested sowing dates in the first and second seasons, respectively. In 1994 and 1995 roselle growing seasons, the abundance level of A. gossypii, E. lybica, T. tabaci, B. tabaci, Earias insulana Boisd., Oxycarenus hyalinipennis Costa and Tetranychus spp. varied significantly according to the date of planting. The differences between average numbers of these pests were highly significant, except for E. lybica that showed insignificant variations in both seasons. Numbers of Tetranychus spp. insignificantly varied in the second season. The differences between the five tested transplanting dates on the rate of occurrence of the four insect species A. gossypii, E. lybica, T. tabaci, B. tabaci and the two mite species, Tetranychus spp. and B. abovatus on peppermint plants proved to be statistically significant in the two studied seasons of 1995 / 1996 and 1996/ 1997. E. lybica and A. gossypii showed insignificant variances during the first and second seasons, respectively. T. tabaci, Tetranychus spp. and E. lybica average numbers insignificantly differed in the first season and significantly in the second one. B. tabaci and B. obovatus appeared on mint plants with high numbers with the fifth transplanting date compared with other pests.
Concerning to the effect of planting spaces, it was found that B. tabaci and Tetranychus spp. infesting guar plants significantly varied according to the sowing spaces in both seasons. Whereas, A. gossypii and T. tabaci differently responded and varied from one season to another. E. lybica insignificantly influenced by changing sowing spaces. The obtained data demonstrated that the fourth sowing space of roselle was more suitable for A. gossypii development and reproduction as compared with the other tested spaces during the first season. A. craccivora and Tetranychus spp. individuals completely disappeared with all sowing spaces during the second season of 1995. A. craccivora disappeared with the second space (30 cm) while Tetranychus spp. disappeared on the second and fourth ones in the first season. E. lybica disappeared on roselle plants in the third and fourth spaces during the second season. A. gossypii, E. lybica, T. tabaci, B. tabaci, Tetranychus spp. and B. obovatus infested peppermint plants with all transplanting spaces during the two investigating seasons except A. gossypii and E. lybica that completely vanished with the third and fourth spaces in case of A. gossypii and with the second and fourth spaces with E. lybica in the first season. In the second season, those pests disappeared on plants transplanted with each of the second and fourth spaces, respectively. T. tabaci completely disappeared on plants of all spaces in the second season but in the first season, T. tabaci disappeared with the fourth space only. In both seasons, the effect of tested planting spaces on the incidence of the above-mentioned plants proved to be statistically significant and highly significant.
Publication year 2004
Availability location معهد بحوث وقاية النباتات- 7ش نادى الصيد- الدقى -الجيزة
Availability number
Organization Name
City الزقازيق
serial title Zagazig journal of agricultural research
Author(s) from ARC
External authors (outside ARC)
    السيد مجاهد متولى قسم وقاية النبات ، كلية الزراعة ، جامعة الزقازيق
    سعد سالم محمد حسانين قسم وقاية النبات ، كلية الزراعة ، جامعة الزقازيق
Agris Categories Pests of plants
AGROVOC
TERMS		 Acarina. Aphis gossypii. Bemisia tabaci. Cyamopsis psoralioides. Insecta. Mentha piperita. Pests of plants. Roselle. Spacing. Tetranychus. Thrips tabaci. Timing.
Publication Type Journal
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