Bulletin of Insectology (2010) 63, 39-43

Sara Zarghami, Hossein Allahyari, Mohammad Reza Bagheri and Alireza Saboori (2010)
Effect of nitrogen fertilization on life table parameters and population growth of Brevicoryne brassicae
Bulletin of Insectology 63 (1), 39-43
Abstract: To investigate the effect of nitrogen fertilization on fitness of cabbage aphid, Brevicoryne brassicae L. (Hemiptera Aphididae), oilseed rape (RGS003 cultivar) was treated with different nitrogen rates. Nitrogen fertilization treatments were 0, 50, 100, and 150% of recommended rates. The results showed that increase in nitrogen fertilization resulted in an increase in the soluble nitrogen concentration in plants. The aphid feeding on plants receiving higher nitrogen fertilizer (150%) had shorter total prereproduction period, longer reproductive period, as well as greater fecundity, but nitrogen fertilization had no effect on adult longevity. Life table parameters of aphid on various treatments were calculated, jackknife method was also used to determine the uncertainty of parameters. The intrinsic rate of increase in treatments of 0, 50, 100, 150% were determined as 0.28, 0.27, 0.31, and 0.35 (female/female/day), respectively. The results revealed that developed aphid on treated plants that received 150% nitrogen had higher reproduction ability compared with those developed on other treatments. The greenhouse study on aphid population growth on various treatments indicated that 21 day after infestation, highest number of aphid and lowest number of winged were found on treated cabbage with 150% of recommended nitrogen fertilization. This means that higher nitrogen fertilization improves the suitability of oilseed rape for cabbage aphid whose performances are then increased.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): Hossein Allahyari, Alireza Saboori

Research topic(s) for pests/diseases/weeds:
environment - cropping system/rotation

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Brevicoryne brassicae	Rape/canola (Brassica napus)