Paper Information

Journal:   JOURNAL OF AGRICULTURAL SCIENCE (UNIVERSITY OF TABRIZ)   2003 , Volume 13 , Number 3; Page(s) 79 To 86.
 
Paper: 

COMPARISON OF INTRINSIC RATE OF INCREASE AND MEAN RELATIVE GROWTH RATE OF CABBAGE APHID (BERVICORYNE BRASSICAE L.) ON FOUR RAPESEED (BRASSICA NAPUS L.) VARIETIES IN GROWTH ROOM

 
 
Author(s):  MOHARAMIPOUR S.*, MONFARED A., FATHIPOUR Y.
 
* DEPARTMENT OF AGRICULTURAL ENTOMOLOGY, COLLEGE OF AGRICULTURE, TABIAT MODARRES UNIVERSITY,IRAN
 
Abstract: 
Antibiosis potential of four rapeseed oil varieties namely: Eurol Okapi PF and Boomrang to cabbage aphid were studied at 20±2°C 60±10% (RH) and photoperiod of 16:8 (L: D) in two separated experiments. In the first experiment parameters measured for making inferences about antibiosis were pre-reproductive period reproductive rate and intrinsic rate of increase (r__m). The experiment was arranged in a completely randomized design with ten replications. Seeds were planted in pots with 12cm diameter by 15cm height. Plants were infested at the 2-3-leaf stage. Experiments were initiated with nymphs less than 24 hours old. When they were developed to adult cages were inspected daily for nymphs. Nymphs were counted and removed until the adult aphids died. In the second experiment in order to measure the mean relative growth rate (MRGR) 10 one day nymphs were weighed and confined in leaf cages (one nymph per cage) on the plant varieties. Thereafter they were let to feed for four days and weighed again. Results indicated that Boomrang was the most susceptible variety. Parameters such as reproductive rate (3.87 nymph / day) and r__m (0.29) were significantly higher in Boomrang than other varieties. Okapi was relatively the most resistant variety in this experiment.
 
Keyword(s): ANTIBIOSIS,CABBAGE APHID, MRGR, RAPESEED, R__M.
 
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