FACTORS AFFECTING DISTRIBUTION PATTERNS OF THE SOFT SCALE , PULVINARIA TENUIVALVATA ( NEWSTEAD ) IN SUGAR CANE FIELDS | ||||
| Egyptian Journal of Agricultural Research | ||||
| Article 9, Volume 83, Issue 1, March 2005, Page 95-107 PDF (2.49 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejar.2005.238044 | ||||
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| Authors | ||||
| MOHAMMAD A. MOHAMMAD1; ABDEL-MONEM S. EL-KHOULY1; EL-METWALLY F. EL METWALLY2; MOHAMED S. SHALABY2 | ||||
| 1Department of Plant Protection , Faculty of Agriculture, Al - Azhar University, Nasr City, Cairo, Egypt | ||||
| 2Plant Protection Research Institute, Agricultural Research Center, Dokki, Giza, Egypt | ||||
| Abstract | ||||
| Population estimation of P. tenuivalvata was done in different sites of the cane field, i. e. east, north, south, west and field center. Results revealed that insect density proportionally increased from May to December in all field sites and the scales became intensive throughout September - November. It was found that plants locating in west site intensively harbored the highest population of scales followed by north site. The number of scales on plant - cast and south sites were approximately similar. Center site had the lowest number of insects. Plant infestation decreased as the distance between plant location and field boarder increased, so cane plants nearby the field boarder were heavily infested than plants far from field boarder. At the same time, the lower part of the cane plant seems to be the poorest site for insect location and feeding while the middle was the most favorable site followed by the upper part of the cane plant. P. tenuivalvata prefers lower surface of cane leaves for settling and feeding. Nymph and adult stages showed clear preference to north-western direction of sugarcane field where its population was always abundant allover the season. | ||||
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