Effects of natural enemies and alate immigration on soybean aphid population dynamics

2016 ◽  
Author(s):  
Alejandro C. Costamagna
Keyword(s):  
Population Dynamics ◽  
Natural Enemies ◽  
Soybean Aphid ◽  
Aphid Population

Soybean Aphid Population Dynamics, Soybean Yield Loss, and Development of Stage-Specific Economic Injury Levels

2009 ◽  
Vol 101 (5) ◽  
pp. 1080-1092 ◽  
Author(s):  
Michael A. Catangui ◽  
Eric A. Beckendorf ◽  
Walter E. Riedell
Keyword(s):  
Population Dynamics ◽  
Yield Loss ◽  
Soybean Aphid ◽  
Aphid Population ◽  
Soybean Yield ◽  
Economic Injury

scholarly journals SOIL NUTRITION MANAGEMENT AND PREDATION BY CHEILOMENES SEXMACULATA (COLEOPTERA: COCCINELLIDAE) IMPACTS ON APHIS GLYCINES (HOMOPTERA: APHIDIDAE)

2010 ◽  
Vol 10 (2) ◽  
pp. 131-145
Author(s):  
Rosma Hasibuan ◽  
Jamalam Lumbanraja
Keyword(s):  
Natural Enemies ◽  
Soil Nutrient ◽  
Soybean Aphid ◽  
Aphis Glycines ◽  
Chicken Manure ◽  
Aphid Population ◽  
Soybean Aphids ◽  
Soil Nutrition ◽  
Nutrition Management ◽  
The Mean

Soil nutrition management and predation by Cheilomenes sexmaculata (Coleoptera: Coccinellidae) impacts on Aphis glycines (Homoptera: Aphididae).  Understanding how soil nutrient availability and natural enemies impacts on aphid populations are important for soybean aphid,  Aphis glycines Matsumura (Homoptera: Aphididae), management. Studies were conducted to examine the effect of soil nutrient management and predaceous coccinellid beetle, Cheilomenes sexmaculata (Fabr.), (Coleoptera: Coccinellidae) on A. glycines population.  The plot size of 300 m2 was set up into 12 plots consisting four treatments and three replications.   The treatments were the combination of NPK (urea 100 kg ha-1 + SP-36 200 kg ha-1 + KCl 200 kg ha-1) levels, dolomite (4 ton ha-1), compost  (10 ton ha-1), and chicken manure (10 ton ha-1). While, the predator’s potential of C. sexmaculata was measured both in the field and laboratory conditions.  The results of the studies indicated that soil nutrition treatments had significant effects on the plant performances: leaf numbers; pod numbers; and plant height. In line with this result, there were significant effects of soil nutrient treatments on the amount of plant nutrient: C, N, P, K, C, Ca, and Mg.  The positive correlation coefficient was observed between the aphid population and nitrogen content, while the significant negative correlation found on between aphid population and the calcium and magnesium content.  Meanwhile, the mean number of soybean aphids (A. glycines)  consumed by C. sexmaculata increased from 8.915 to 40.64  aphids, with an average  26.35 ± 3.16 aphids.  The mean numbers of aphids consumed by predator were significantly influenced by prey densities.   The exclosure study result showed that the densities of A. glycines  in caged plants was higher than that in un-caged plants. In the no-cage treatments, natural enemies had complete access to soybean aphids and caused the total reduction (100%) of A. glycines density by the 8th wk sample period. These findings suggest that reducing the amount of synthetic chemical fertilizer NPK can be supplemented with natural organic materials such as composts and chicken manure and natural occurring predator, C. sexmaculata, is an important natural enemy of the soybean aphid.

BIOEFFICACY OF PLANT EXTRACTS AGAINST MUSTARD APHID AND THEIR NATURAL ENEMIES

2019 ◽  
Vol 25 (1) ◽  
Author(s):  
NARENDRA SINGH ◽  
N. S. BHADAURIA ◽  
PRADYUMN SINGH
Keyword(s):  
Plant Extracts ◽  
Natural Enemies ◽  
Untreated Control ◽  
Plant Material ◽  
Aphid Population ◽  
College Of Agriculture ◽  
Mustard Aphid ◽  
Plant Materials

The Bio-efficacy of eleven plant extracts namely viz.Neem Kernel; Rhizome of Ginger; Leaves of Datura, Gajarghas, Harsingar, Oak and Latjeera; Bulb of Garlic and Onion; Flowers of Chrysenthemum and Fruits of Chilli in the concentration of 5 percent and imidacloprid @ 40 g ai/ha was tested against mustard aphid, Lipaphiserysimi and their effect on D. rapae and Coccinellid beetle were tested in the Department of Entomology, College of Agriculture, Gwalior (M.P.). All the tested plant materials and imidacloprid @ 40 g ai/ha were effective significanty in reducing the aphid population over control.The aphid population in treated plots ranged from 7.2 to 40.0 as against 85.4 aphid/twig in untreated control. Among the plant material, three sprays of Neem Kernel were found most effective followed by three sprays of chilli fruits.All the plant extracts were found significantly safer to D. rapae and coccinellid bettle in comparision to insecticide (imidacloprid).

scholarly journals Population dynamics of exotic rugose spiralling whitefly, Aleurodicus rugioperculatus Martin (Hemiptera: Aleyrodidae) on coconut as influenced by weather factors and natural enemies

2020 ◽  
pp. 120-125
Author(s):  
K. Elango ◽  
S. Jeyarajan Nelson
Keyword(s):  
Population Dynamics ◽  
Negative Correlation ◽  
Natural Enemies ◽  
Tamil Nadu ◽  
Abiotic Factors ◽  
Climatic Conditions ◽  
Weekly Interval ◽  
Maximum Temperature ◽  
Weather Factors ◽  
Extent Of Damage

The rugose spiralling whitefly, Aleurodicus rugioperculatus Martin is a new exotic pest occurring in several crops including coconut since 2016 in India. Due to variation in the agro-climatic conditions of different regions, arthropods show varying trends in their incidence also in nature and extent of damage to the crop. Besides, abiotic factors also play a key role in determining the incidence and dominance of a particular pest and their natural enemies in a crop ecosystem. The population dynamics of new exotic whitefly species, A. rugioperculatus and their associated natural enemies was assessed on five-year-old Chowghat Orange Dwarf coconut trees at Coconut Farm of Tamil Nadu Agricultural University. The study indicated that RSW was found throughout the year on coconut and the observation recorded on weekly interval basis shows that A. rugioperculatus population escalated from the first week of July 2018 (130.8 nymphs/leaf/frond) reaching the maximum during the first week of October (161.0 nymphs/leaf/frond) which subsequently dwindled to a minimum during April. The parasitisation by E. guadeloupae on RSW ranged from 31.60 percent in Aug. 2018 to 57.60 percent in December 2018. The association of biotic and abiotic factors with A. rugioperculatus population showed a negative correlation with E. guadeloupae and C. montrouzieri. There was a significant positive correlation between maximum temperature and minimum temperature as well as relative humidity. However, rainfall showed a negative correlation with A. rugioperculatus population.

scholarly journals Population dynamics of sucking insect pests and its natural enemies on okra agro-ecosystem in Chitrakoot region

2013 ◽  
Vol 8 (28) ◽  
pp. 3814-3819 ◽  
Author(s):  
Singh Yajuvendra ◽  
Jha Aastik ◽  
Verma Savita ◽  
K Mishra V ◽  
S Singh S
Keyword(s):  
Population Dynamics ◽  
Natural Enemies ◽  
Insect Pests

The Migratory Ambit of the Hop Aphid and its Significance in Aphid Population Dynamics

10.2307/4207 ◽  
1979 ◽  
Vol 48 (3) ◽  
pp. 955 ◽  
Author(s):  
L. R. Taylor ◽  
I. P. Woiwod ◽  
R. A. J. Taylor
Keyword(s):  
Population Dynamics ◽  
Aphid Population
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