POPULATION DENSITY OF MITES IN SOYBEAN FIELDS AS AFFECTED BY NODULATION AND NITROGENOUS FERTILIZATION. | ||
| Journal of Plant Protection and Pathology | ||
| Article 1, Volume 30, Issue 10, October 2005, Pages 6263-6268 PDF (1.59 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jppp.2005.239193 | ||
| Author | ||
| A. A. Younes | ||
| Gemmeiza Agricultural Research Station. | ||
| Abstract | ||
| The experiment was conducted at Gemmeiza Agricultural Research Station, Gharbia in 2003 season. The study aimed to find the effect of nodulation (or not) of soybean seed with the microsymbiont Bradyrhizobium japonicum as well as nitrogen fertilization applied as ground fertilization at 15 and 30 kg/fed, or as spray fertilization (three sprays) at 15 and 30 kg/fed. Population density of the spider mite, Tetranychus cucurbitacearum (Sayed) and soil mites were evaluated. Results indicated that population density of the phytophagous mite, T. cucurbitacearum on five leaflets increased significantly with nodulation, n- fertilization applied as ground or spray fertilization at 15 and 30 kg/fed. Ground fertilization (30 kg/f.) induced the highest increase in population while the spray fertilization (15 kg/f.) caused the lowest number when compared with untreated check. Total population densities of soil mites : Gamasida, Actinedida, Oribatida and Acaridida increased with nodulation and fertilization and this was highly noticed with nodulation and 30 kg/f. ground fertilization. Soil mites density increased according to plant growth stage all over the growing season. Oribatida and Gamasida were dominant after third spray | ||
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