Invasive Aphid Strikes Sorghum in the U.S.

2019 ◽  
Vol 30 (6) ◽  
pp. 250-253
Author(s):  
Adrianna Szczepaniec
Keyword(s):  
Natural Enemies ◽  
Insect Pests ◽  
Invasive Pest ◽  
Pest Species ◽  
Invasive Insects ◽  
Long Term Stability ◽  
Parthenogenetic Reproduction ◽  
Abundance And Diversity ◽  
Alien Insect

Invasions of alien insect pests often result in dramatic shifts in the entire ecosystems brought about by severe outbreaks of the pests exploiting new and frequently defenseless host plants. The explosive population dynamics of invasive insects often enable them to outcompete native pest species and alter both the abundance and diversity of communities of their natural enemies. These impacts are probably the most conspicuous and notorious when the invaded host plant is a key commodity crop and the invasive pest an aphid (Hemiptera: Aphididae). Aphids have a remarkable ability to overwhelm their plant hosts extremely rapidly owing to their parthenogenetic reproduction (i.e., daughters are clones of their mothers), live birth, and telescoping generations (i.e., the offspring of unborn aphids are already developing within their bodies). Aphids also attract exceptionally diverse communities of predators and parasitoids, which are strongly attracted to the volatiles emitted from plants attacked by aphids, albeit the natural enemies' attraction to invasive aphids often requires a period of adaption to recognize a new prey. Hence, when new species of aphids invade a new agroecosystem, their presence frequently creates an ?ecosystem earthquake' that can have profound implications for long-term stability of the system most directly affected by the invasive aphid as well as neighboring crops.

Biosecurity risks of invasive alien insect pest species pathways through shared borders with Nigeria

2020 ◽  
Vol 16 (2) ◽  
pp. 13-23
Author(s):  
B.O. Bobadoye ◽  
A.O. Bobadoye
Keyword(s):  
Forest Ecosystems ◽  
Insect Pests ◽  
Insect Pest ◽  
Forest Policy ◽  
Pest Species ◽  
Policy Makers ◽  
Border Line ◽  
National Border ◽  
Alien Pest ◽  
Alien Insect

Understanding the biosecurity risks that invasive alien insect pest species currently ravaging forest trees pose is of great importance to forest ecosystems and health. This problem has posed significant challenges to researchers, relevant stakeholders, policy makers and national biosecurity agencies worldwide. This study gives an overview of the top 15 suspected insect pest species most likely to invade or have already invaded forested habitats in order to disrupt ecosystem services and biodiversity within the borders of Nigeria through borderline states (Gombe, Jigawa, Borno, Yobe, Sokoto, Cross River and Lagos). For Nigeria as a whole, all of these top 15 pest species have already established, with identified intra- border line states having no significant effect on severity of invasions ( F1,6=0.07, P=0.910) when compared to identified inter-border line states. This study concludes that the immediate biosecurity risks from already identified invasive insect pests are greater from outside country (inter) borders of Nigeria than within state-to-state (intra) borders of Nigeria. Our findings have potentially significant implications for immediate implementation of national biosecurity forest policy Acts in compliance with Cartagena and Nagoya protocols, emphasizing the need to initiate and implement biosecurity measures simultaneously with any ongoing trans-national border interventions. Keywords: Biosecurity, invasive alien pest species, forests, Nigeria

Gall Insect Menace in Eucalyptus

2016 ◽  
Vol 39 (4) ◽  
pp. 349-357
Author(s):  
N. Roychoudhury
Keyword(s):  
Natural Enemies ◽  
Host Plants ◽  
Developmental Stages ◽  
Insect Pests ◽  
Seasonal Occurrence ◽  
Gall Formation ◽  
Leptocybe Invasa ◽  
Gall Insect

Altogether about 920 species of insects recorded from Eucalyptus worldwide, about six species are gall insects. Of these, Leptocybe invasa, is a major nursery pest of Eucalyptus, exclusively responsible for gall formation in seedlings and saplings, including coppice shoots. The insect has threatened Eucalyptus propagation in nursery stage. The present paper has reviewed succinctly the insect pests of Eucalyptus with special emphasis on gall insect, Leptocybe invasa Fisher & LaSalle (Hymenoptera : Eulophidae), its seasonal occurrence, nature of damage, host plants and description of gall insect, developmental stages of gall, natural enemies and management. The paper has highlighted the need for long term strategies to combat against this severe pest to prevent its spread.

EFFECTS OF PRECIPITATION ON CROP INSECTS

1970 ◽  
Vol 102 (11) ◽  
pp. 1360-1373 ◽  
Author(s):  
Bryan P. Beirne
Keyword(s):  
Soil Moisture ◽  
Life Cycle ◽  
Pest Control ◽  
Natural Enemies ◽  
Insect Pests ◽  
Control Agent ◽  
Pest Species ◽  
Mechanical Factor ◽  
Annual Crops

Abstract A review and analysis of the literature showed that precipitation, or its absence, can regulate the numbers of or the damage by insect pests of annual crops in Canada in essentially four main ways: as soil moisture, when the insects are in the ground; as a mechanical factor that impinges directly on them when they are exposed; through its effects on foodplants; and through its effects on natural enemies of the pests. Though any one pest species may be influenced by two or more of these processes and in different ways by each depending on the stage of its life cycle that is affected, usually only one way is significant. Precipitation is so far of little value in forecasting pest situations reliably, but water in various forms has much potential for use as a pest control agent.

scholarly journals Attract, reward and disrupt: responses of pests and natural enemies to combinations of habitat manipulation and semiochemicals in organic apple

2021 ◽  
Author(s):  
Joakim Pålsson ◽  
Mario Porcel ◽  
Teun Dekker ◽  
Marco Tasin
Keyword(s):  
Biological Control ◽  
Natural Enemies ◽  
Ecosystem Service ◽  
Production Systems ◽  
Insect Pests ◽  
Mating Behaviour ◽  
Generalist Predators ◽  
Pest Species ◽  
Insect Community ◽  
Biological Pest Control

AbstractThe widespread use of pesticides along with the simplification of the landscape has had undesirable effects on agroecosystems, such as the loss of biodiversity and the associated ecosystem service biological control. How current production systems can be remodelled to allow for a re-establishment of biological pest control, while preserving productivity, is a major challenge. Here, we tested whether a combination of tools could augment or synergize biological control of insect pests in apple (Malus domestica), comprised of a tortricid pest complex, a geometrid pest complex and the rosy apple aphid. The tools aimed at disrupting mating behaviour of multiple pest species (multispecies mating disruption, “Disrupt”, MMD), attracting natural enemies (a blend of herbivory-induced volatiles, “Attract”, A), or providing refuge and rewards for a diverse insect community (perennial flower strip, “Reward”, R) over a 3-year period. Suction samples were consistently richer in generalist predators but not in parasitoids when multiple tools including MMD + A + R or MMD + A were employed. In addition, lepidopteran pest levels were significantly lower in these plots than in MMD or MMD + R at the end of the 3-year experiment. This was, however, not reflected in survival of artificially established aphid colonies. Our data indicates that multiple, complementary tools can greatly enhance natural enemy level, but also that long-term implementation is needed to fully realize the augmentatory or synergistic potential of complementary components and restore biological control as an ecosystem service of practical relevance.

scholarly journals Effect of Climate Change on Introduced and Native Agricultural Invasive Insect Pests in Europe

Insects ◽  
2021 ◽  
Vol 12 (11) ◽  
pp. 985
Author(s):  
Sandra Skendžić ◽  
Monika Zovko ◽  
Ivana Pajač Živković ◽  
Vinko Lešić ◽  
Darija Lemić
Keyword(s):  
Climate Change ◽  
Biological Invasion ◽  
Insect Pests ◽  
Abiotic Factors ◽  
Insect Pest ◽  
Diet Breadth ◽  
Economic Damage ◽  
Pest Species ◽  
Invasive Insects ◽  
Factors Affecting

Climate change and invasive species are major environmental issues facing the world today. They represent the major threats for various types of ecosystems worldwide, mainly managed ecosystems such as agriculture. This study aims to examine the link between climate change and the biological invasion of insect pest species. Increased international trade systems and human mobility have led to increasing introduction rates of invasive insects while climate change could decrease barriers for their establishment and distribution. To mitigate environmental and economic damage it is important to understand the biotic and abiotic factors affecting the process of invasion (transport, introduction, establishment, and dispersal) in terms of climate change. We highlight the major biotic factors affecting the biological invasion process: diet breadth, phenological plasticity, and lifecycle strategies. Finally, we present alien insect pest invasion management that includes prevention, eradication, and assessment of the biological invasion in the form of modelling prediction tools.

Management of beneficial invertebrates and their potential role in integrated pest management for Australian grain systems

2008 ◽  
Vol 48 (12) ◽  
pp. 1531 ◽  
Author(s):  
Joanne C. Holloway ◽  
Michael J. Furlong ◽  
Philip I. Bowden
Keyword(s):  
Integrated Pest Management ◽  
Pest Management ◽  
Natural Enemies ◽  
Insect Pests ◽  
Cropping Systems ◽  
Insect Pest ◽  
Environmental Benefits ◽  
Pest Species ◽  
Grain Crops ◽  
The Impact

Beneficial invertebrates (predators and parasitoids) can make significant contributions to the suppression of insect pest populations in many cropping systems. In Australia, natural enemies are incorporated into integrated pest management programs in cotton and horticultural agroecosystems. They are also often key components of effective programs for the management of insect pests of grain crops in other parts of the world. However, few studies have examined the contribution of endemic natural enemies to insect pest suppression in the diverse grain agroecosystems of Australia. The potential of these organisms is assessed by reviewing the role that natural enemies play in the suppression of the major pests of Australian grain crops when they occur in overseas grain systems or other local agroecosystems. The principal methods by which the efficacy of biological control agents may be enhanced are examined and possible methods to determine the impact of natural enemies on key insect pest species are described. The financial and environmental benefits of practices that encourage the establishment and improve the efficacy of natural enemies are considered and the constraints to adoption of these practices by the Australian grains industry are discussed.

scholarly journals Diversity and equitability of insect pests and natural enemies in brinjal field treated with insecticide

2016 ◽  
Vol 4 (1) ◽  
pp. 71-80
Author(s):  
A Awal ◽  
MM Rahman ◽  
MZ Alam ◽  
MMH Khan
Keyword(s):  
Visual Search ◽  
Natural Enemies ◽  
Insect Pests ◽  
Diversity Index ◽  
Insect Pest ◽  
Pitfall Trap ◽  
Pest Species ◽  
Total Abundance ◽  
Net Method ◽  
Sweep Net

Experiment was conducted during winter season to study the diversity and equitability of insect pest species and natural enemies in insecticide treated brinjal fields. Highest number of insect pests were recorded in` Tracer 45 SC, Bactoil (Bt), Nimbicidene 0.03 EC and lowest was in Necstar-50 EC and Proclaim-5 SG treated plots. The highest total abundance of insect pest was recorded in the plots treated with Bactoil and Tracer-45 SC and lowest total abundance was in Helicide (HNPV), Proclaim-5 SG and Booster-10 EC treated plots. The diversity index and equitability of insect pest species were highest in the plots treated with Nimbicidene 0.03 EC and Bactoil in visual search and sweep net methods while Bactoil and Booster 10 EC in pitfall trap method. However, lowest diversity index and equitability were obtained from the plots treated with Booster 10 EC, Proclaim-5 SG, Necstar-50 EC, Tracer-45 SC in visual search and sweep net methods but also in plots treated with Nimbicidene 0.03 EC in pitfall trap method. In case of natural enemies, the highest number of families were recorded in Tracer-45 SC, Nimbicidine 0.03 EC and Bactoil treated plots while lowest was in Helicide, Booster 10 EC, Proclaim-5 SG and Necstar-50 EC treated plots. The highest total abundance of natural enemy was recorded in the plot treated with Bactoil and Tracer-45 SC while lowest abundance was in the plot treated with Necstar-50 EC and Boster-10 EC. The diversity index and equitability of natural enemies were the highest in the plots treated with Proclaim-5 SG, Bactoil, Helicide and Necstar-50 EC in visual search, sweep net method and pitfall trap method while lowest was in Booster 10 EC, Tracer-45 SC treated plots in visual search method, Booster 10 EC and Nimbicidene 0.03 EC treated plots in sweep net method, Necstar-50 EC and Nimbicidene 0.03 EC treated plots in pitfall trap method. Bactoil and Tracer-45 SC were relatively safe for natural enemies and therefore would be fit well into integrated pest management (IPM) against BSFB of brinjal crop.Jahangirnagar University J. Biol. Sci. 4(1): 71-80, 2015 (June)

scholarly journals Mechanisms of non-consumptive effects of parasitoid wasps on aphid populations : enhancing aphid suppression by increasing natural enemy and plant diversity

2016 ◽  
Author(s):  
◽  
Kathryn Suzanne Ingerslew
Keyword(s):  
Biological Control ◽  
Plant Diversity ◽  
Natural Enemies ◽  
Pea Aphid ◽  
Aphidius Ervi ◽  
Pest Species ◽  
Short Term ◽  
Pea Aphids ◽  
Aphid Populations

Predators are typically evaluated for their potential effectiveness as natural biological control agents by examining traits related to their consumptive relationship with an herbivore. For example, voracious predators with a high prey attack rate or predators that specialize in consuming a particular pest species are considered ideal for biological control. However, there is a growing body of research demonstrating that predators also influence herbivore population size through non-consumptive interactions. Non-consumptive interactions include changes in prey behavior, morphology, or life-history traits in response to the presence of a predator that allow prey to survive a predator encounter but result in declines in prey fitness due to reduced availability of resources or expending energy that would have been otherwise used for growth or reproduction. The existence of non-consumptive effects is significant because it raises the possibility that a non-lethal organism (i.e. non-enemy) in the environment can also contribute to herbivore suppression if an herbivore inaccurately perceives an organism as a threat and engages in a defensive response. The goal of my dissertation research was to determine whether non-enemies contribute to natural biological control and enhance herbivore suppression beyond levels accomplished by consumptive natural enemies alone. Previous work in our lab demonstrated that pea aphids Acyrthosiphon pisum (Harris) respond to the non-enemy wasp Aphidius colemani Viereck by stopping feeding and dropping off of their host plant, resulting in a decline in pea aphid abundance even though pea aphids are not a host for A. colemani. My work evaluated whether this behavioral suppression of pea aphid populations by the non-enemy wasp is complementary with pea aphid suppression by the consumptive enemy Aphidius ervi Haliday. I investigated 1) the mechanisms responsible for and the magnitude of the non-consumptive effects of A. colemani and A. ervi on pea aphid populations, 2) the contributions of non-consumptive interactions to short-term and long-term suppression of aphid populations in the presence of consumptive natural enemies, and 3) the feasibility of increasing plant diversity in the field to enhance pea aphid suppression by facilitating behavioral non-consumptive interactions. I found that pea aphids respond to interactions with both wasp species, but they more frequently engaged in defensive behaviors such as dropping in the presence of the enemy A. ervi than the non-enemy A. colemani. The behavioral response of the pea aphid to the presence of the non-enemy was strong enough for A. colemani to suppress pea aphid populations in the short term, but this suppression was not maintained over the long term. When the non-enemy A. colemani was combined with the consumptive enemy A. ervi, there was some evidence for antagonism between the wasps over the short term. However, the non-enemy and enemy were complementary in their suppression of pea aphid populations over the long term, with more consistent and stable suppression when both wasps were present. I also demonstrated that increasing plant diversity in a field setting enhances suppression of pea aphid populations by promoting interactions between pea aphids and non-enemies. My work demonstrates that non-lethal organisms, or non-enemies, in the environment have an important role to play in influencing herbivore abundance, and that the addition of non-enemies to a community of lethal predators and parasitoids can lead to greater and more consistent suppression of herbivores in the long term.

scholarly journals The Long-Term Effects of Reduced Competitive Ability on Foraging Success of an Invasive Pest Species

2016 ◽  
Vol 109 (4) ◽  
pp. 1628-1635
Author(s):  
Fabian Ludwig Westermann ◽  
Vaughn Antony Bell ◽  
David Maxwell Suckling ◽  
Philip John Lester
Keyword(s):  
Competitive Ability ◽  
Invasive Pest ◽  
Pest Species ◽  
Foraging Success ◽  
Long Term Effects ◽  
Invasive Pest Species

scholarly journals Studies on insect diversity in jasmine (Jasminum sambac L.) ecosystem

2021 ◽  
Vol 42 (6) ◽  
pp. 1470-1477
Author(s):  
U. Pirithiraj ◽  
◽  
R.P. Soundararajan ◽  
C.G.L. Justin ◽  
V. Lakshmanan ◽  
...  
Keyword(s):  
Natural Enemies ◽  
Management Practices ◽  
Insect Pests ◽  
Cropping Systems ◽  
Cropping System ◽  
Diversity Indices ◽  
Insect Diversity ◽  
Chemical Inputs ◽  
Abundance And Diversity ◽  
Jasminum Sambac

Aim: Study was carried out to record the abundance and diversity of insects in jasmine (Jasminum sambac L.) ecosystem. Methodology: To determine insect pests, natural enemies and non-insect diversity, fortnight observations were taken from second fortnight of September'19 to March'20 on insect population at three adjacent locations. Abundance and diversity indices were computed using mean data. The management practices, presence of weeds and adjacent cropping systems were also recorded at three locations to determine the reasons for variation in the diversity of organisms. Results: A total of 3335 individuals arthropods belonging to 55 species, which included 32 species of herbivores and 23 species of natural enemies were recorded throughout the study period. Location 3 had perennial crops in the vicinity, un-weeded ecosystem with no chemical inputs. Among various diversity indices calculated, Margalef Richness Index of herbivores was higher at location 3 (1.67) than location 1 (1.17) and 2 (0.76). Interpretation: The abundance and diversity of insects in different jasmine ecosystem depends on the chemical inputs and adjacent cropping system.

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