Population dynamics of green apple aphid Aphis Pomi De Geer (Homoptera: aphididae) and Its Natural enemies in apple orchard of Kashmir

The species composition and seasonal abundance of aphids and their natural enemies were investigated in an apple orchard located in central Peloponnese. For that purpose shoots were collected at weekly intervals. The aphid species Aphis pomi De Geer (Hemiptera: Aphididae), Dysaphis plantaginea (Passerini) (Hemiptera: Aphididae) and Eriosoma lanigerum (Hausmann) (Hemiptera: Eriosomatidae) were recorded. In both years of the study, A. pomi developed higher populations than the other two species. The population of A. pomi was high in June and July. D. plantaginea was present in April and May, with high numbers mainly in May, whilst E. lanigerum was recorded in low numbers from May to July. The number of aphids was not found to differ significantly between samples collected from the northern and southern part of the trees. The species composition of aphid population on each sampled shoot, documented spatial segregation between A. pomi and D. plantaginea. It was proved that the eggs were more commonly laid near the buds of the central part of the twigs. The natural enemies found were predators belonging to the families of Coccinellidae, Chrysopidae, Syrphidae and Anthocoridae. Generally, their numbers were low.

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THE DYNAMICS OF APHIS POMI DE GEER (HOMOPTERA: APHIDIDAE) AND ITS PREDATOR, APHIDOLETES APHIDIMYZA (RONDANI) (DIPTERA: CECIDOMYIIDAE), ON APPLE IN NOVA SCOTIA

The Canadian Entomologist ◽

10.4039/ent129627-4 ◽

1997 ◽

Vol 129 (4) ◽

pp. 627-636 ◽

Cited By ~ 15

Author(s):

Heather C. Stewart ◽

Sandra J. Walde

Keyword(s):

Population Dynamics ◽

Nova Scotia ◽

Density Dependence ◽

Growing Season ◽

Predation Rate ◽

Apple Orchard ◽

Predator Population ◽

Aphidoletes Aphidimyza ◽

Predator Density ◽

Aphis Pomi

AbstractThe dynamics of Aphis pomi De Geer (Homoptera: Aphididae) and its predator, Aphidoletes aphidimyza (Rondani) (Diptera: Cecidomyiidae), were studied over two seasons in a commercial apple orchard in Nova Scotia. Aphid and predator population dynamics were very different in the two seasons. The most numerous predator in both years was A. aphidimyza. This predator was found in the earliest colonies sampled each season and was present throughout the growing season. In the year with relatively high aphid densities a single peak in aphid and predator density was seen in mid-July, just prior to maximum predation rate. The predator’s numerical response resulted in delayed density dependence in predation rate. In the year of low aphid densities, predator and prey dynamics appeared uncoupled, and a higher rate of colony turnover may have been caused by other predators such as mirids. Aphidoletes aphidimyza tended to aggregate oviposition in high-density aphid colonies, but this aggregation resulted in predation that was only very weakly spatially density dependent.

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

Journal of Plantation Crops ◽

10.25081/jpc.2020.v48.i2.6370 ◽

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.

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

African Journal of Agricultural Research ◽

10.5897/ajar12.1743 ◽

2013 ◽

Vol 8 (28) ◽

pp. 3814-3819 ◽

Cited By ~ 1

Author(s):

Singh Yajuvendra ◽

Jha Aastik ◽

Verma Savita ◽

K Mishra V ◽

S Singh S

Keyword(s):

Population Dynamics ◽

Natural Enemies ◽

Insect Pests

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Survey and population dynamics of cereal aphids and their common natural enemies inhabiting wheat crop in Hail region, Saudi Arabia

Entomological Research ◽

10.1111/1748-5967.12559 ◽

2021 ◽

Author(s):

Khalid A. Asiry

Keyword(s):

Population Dynamics ◽

Saudi Arabia ◽

Natural Enemies ◽

Wheat Crop ◽

Cereal Aphids

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Impact of natural enemies on coffee leafminer Leucoptera coffeella (Lepidoptera: Lyonetiidae) population dynamics in Chiapas, Mexico

Biological Control ◽

10.1016/j.biocontrol.2009.03.021 ◽

2009 ◽

Vol 51 (1) ◽

pp. 51-60 ◽

Cited By ~ 9

Author(s):

J. Refugio Lomeli-Flores ◽

Juan F. Barrera ◽

Julio S. Bernal

Keyword(s):

Population Dynamics ◽

Natural Enemies ◽

Leucoptera Coffeella

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Population dynamics of rice leaffolders (Lepidoptera: Pyralidae) and their natural enemies in irrigated rice in the Philippines

Bulletin of Entomological Research ◽

10.1017/s0007485399000541 ◽

1999 ◽

Vol 89 (5) ◽

pp. 411-421 ◽

Cited By ~ 11

Author(s):

J. de Kraker ◽

A. van Huis ◽

K.L. Heong ◽

J.C. van Lenteren ◽

R. Rabbinge

Keyword(s):

Population Dynamics ◽

Natural Enemies ◽

Natural Enemy ◽

Survival Rates ◽

The Philippines ◽

Cnaphalocrocis Medinalis ◽

Irrigated Rice ◽

Larval Stages ◽

Ovipositional Preference ◽

Rice Leaffolders

AbstractPopulations of rice leaffolders and their natural enemies were studied in eight crops of irrigated rice in Laguna Province, the Philippines. The rice leaffolder complex consisted of three species: Cnaphalocrocis medinalis (Guenée), Marasmia patnalis Bradley and M. exigua Butler. Leaffolder population dynamics were characterized by an egg peak at maximum tillering and a broad larval peak around booting stage. Peak densities ranged from 0.2 to 2.0 larvae per hill. Most larvae originated from immigrant moths and there was no substantial second generation. The seasonal percentage egg parasitism by Trichogramma sp. ranged from 0 to 27%, and percentage larval parasitism from 14 to 56%. The braconid Macrocentrus philippinensis Ashmead was the most commonly reared larval parasitoid. Forty natural enemy taxa that may attack rice leaffolders were identified from suction and sweepnet samples: 24 predator taxa and 16 parasitoid taxa. The estimated survival rates from leaffolder egg to larval stages and between larval stages showed large variation between rice crops, but were not clearly correlated with observed levels of parasitism, natural enemy abundance, or natural enemy to leaffolder ratios. It is suggested that the generally low densities of rice leaffolders in Philippine transplanted rice are caused by their ovipositional preference for crops at the maximum tillering stage, allowing for only one generation, and by high immature mortality caused by the abundant and diverse complex of natural enemies.

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