A survey on the biological control of leafhoppers and planthoppers, injurious to rice plants by Pipunculids (Diptera)

2016 ◽  
Vol 5 (08) ◽  
pp. 4767
Author(s):  
Shailendra Kumar Amogh* ◽  
Ashwani Kumar ◽  
Prakash Michael

The project aim of the research is to find out different species of Pipunculids, natural enemies of rice leaf hoppers and plant hoppers in Indo- Nepal region in order to contribute towards the basic study of taxonomy of Pipunculids and biological control of these pests. In the present work eight specimen of Pipunculids were collected in which two species are new ones (Eudoryllas curvibellata sp. nov. and Pipunculus (Cephalops) Pokharensis sp. nov.) Simultaneously several leaf hoppers were collected and examined in different seasons and in different places. The percentage of parastism by Pipunculids in leaf hoppers was about 27.5%. It was also concluded that fencing of field with flowering plants saves crops because it was observed that the average parasitism was 46.5% in fencing field with flowering plants in comparision to the non-fencing field where the average parasitism was only 13%. Biological control of these pests will offer scope to contribute to better rice pest management.

2017 ◽  
Author(s):  
Ryan Rayl ◽  
Stephen Wratten

Historically, handling insects has usually involved their being killed, but non-lethal approaches are necessary when evaluating the biology of such organisms. Anesthesia has been used as one of these non-lethal approaches. Two common anesthetics used in this way have been carbon dioxide and chilling. These have been used frequently in the literature but have sub-lethal effects on insects that may affect further experimentation. An alternative anesthetic that has potential for experimental use is triethylamine (TEA). This shows promise because of its ease of use and potency as an insect anesthetic, but evidence, if any, of the sub-lethal effects is almost non-existent in the literature. Here, longevity was use as a proxy for fitness as this is a common approach to laboratory work of this type for pests and their natural enemies. A series of experiments were carried out to find the optimal rates for these three selected anesthetics. The organism selected for this work was the fly Scaptomyza flava (Fallén), the larvae of which mine the leaves of commercial brassica crops worldwide. It is a ‘cosmetic’ pest in that damage thresholds for crop rejection are very low and prophylactic use of insecticides is the norm. One way of mitigating the negative environmental aspects of this approach is to enhance biological control. One such way of enhancing biological control is the use of flowering plants, as they can provide alternative resources to natural enemies, which can enhance their ability to control pests. To evaluate these flowering plants, handling of the insects is necessary and anesthesia is used for this purpose. For each anesthetic an optimal rate was found, then these rates were compared to each other in a subsequent experiment. These anesthetics differed markedly in their value in terms of the duration of the anesthesia and other practical considerations. TEA had the longest effect, CO2 and chilling had the shortest. All three were similar in their effects on longevity (i.e. recovery time and mortality rates).


2018 ◽  
Vol 150 (2) ◽  
pp. 265-273
Author(s):  
J. van Zoeren ◽  
C. Guédot ◽  
S.A. Steffan

AbstractBiological control plays an important role in many integrated pest management programmes, but can be disrupted by other control strategies, including chemical and cultural controls. In commercial cranberry (Vaccinium macrocarpon Aiton; Ericaceae) production, a spring flood can replace an insecticide application, providing an opportunity to study the compatibility of the flood (a cultural control) with biological control. We suspect that chemical controls will tend to reduce the number of natural enemies, while the flood, through removal of detritus and detritivores, may cause generalist predators to prey-switch to consume proportionally more pest individuals. We measured the abundance of herbivores (Lepidoptera), detritivores, Arachnida, and parasitoids (Hymenoptera) every week for six weeks in Wisconsin (United States of America) cranberry beds following either an insecticide spray or a cultural control flood. We found that detritivore populations rapidly declined in both flood and spray treatments; conversely, carnivore populations (spiders and parasitoids) were more abundant in the flooded beds than in sprayed beds. Populations of key cranberry pests were similar between flooded and sprayed beds. Our results showed that early-season flooding preserved more natural enemies than an insecticide application. This increase in natural enemy abundance after the flood may allow for greater continuity in herbivore suppression, potentially providing a basis for long-term cranberry pest management.


HortScience ◽  
2015 ◽  
Vol 50 (5) ◽  
pp. 721-732 ◽  
Author(s):  
Heidi M. Wollaeger ◽  
Kristin L. Getter ◽  
Bridget K. Behe

Neonicotinoids have recently been implicated by the media as a contributing factor to the decline of honey and bumblebees. We sought to better understand consumer perceptions and willingness to pay for traditional, neonicotinoid-free, bee-friendly, or biological control pest management practices as growers may seek alternative management practices to systemetic insecticides. We conducted a nationwide Internet survey (n = 3082), where consumers answered attitudinal, comprehension, likelihood-to-buy, and demographical questions about indoor (marketed in 10-cm pots) and outdoor (marketed in 30-cm hanging baskets or 10-cm pots) floriculture products. The likelihood-to-buy questions were analyzed using conjoint analysis to determine which attributes had the greatest part-worth scores or which ones were viewed most positively by survey respondents. Of the total participants, 65.1% (n = 2002) of the subjects had purchased an annual flowering plant in the 12 months before the survey. Respondents reported that the most important plant health and appearance factors that affect their purchasing decisions were that the flowering plants have no plant damage, while the second most important factor was that plants have no insects on them. The least important factor in the ranking of stated importance was that no neonicotinoid insecticides were used during the production of the plant. This finding may have resulted from 56.6% of all participants who reported that they did not understand the term. For those who viewed the indoor 10-cm flowering plants (n = 1052), the plant species accounted for 41.2% of the decision to purchase the plant, followed by production type (32.8%) and price (26.0%). All three product attributes were of equal importance to the subjects who viewed the outdoor 10-cm flowering plants (n = 1024), whereas only price had a lower relative importance when compared with production type and species for those who viewed the 30-cm hanging baskets (n = 1006). Across all three studies, use of the term “bee-friendly” had the greatest economic value because it had the highest part-worth utility score, or the greatest willingness-to-buy. For the subjects who viewed the outdoor plants, “bee-friendly” and “use of beneficial insects” had greater economic value (with positive part-worth utility scores), but “neonicotinoid-free” and “traditional insect control” both had negative part-worth utility scores, indicating they were valued less and detracted from the dollar value of the plant. The term “bee-friendly” was worth up to five times more to those respondents that had bought a plant in the last 12 months compared with those who had not. Therefore, if ornamental plants are labeled with pest management practices, most consumers value the term “bee-friendly” more and will likely discount products labeled “neonicotinoid-free.”


2015 ◽  
pp. 85-106 ◽  
Author(s):  
Shah Fahad ◽  
Lixiao Nie ◽  
Saddam Hussain ◽  
Fahad Khan ◽  
Faheem Ahmed Khan ◽  
...  

1991 ◽  
Vol 67 (5) ◽  
pp. 500-505 ◽  
Author(s):  
V. G. Nealis

Forest insect pest management differs from pest management in other renewable-resource industries because of the relative complexity and stability of the forest environment. An important component of this complexity is the rich fauna of natural enemies attacking most forest insect pests. Understanding the relationship between forest insect pests and their natural enemies would permit better insight into the dynamics of pest populations.The active release of natural enemies in inoculative or inundative release strategies is a direct application of biological control to pest management. The conservation of resident natural enemies is an indirect biological control method with great potential. Knowledge of the ecology of natural enemies can be used to modify other forest practices such as reforestation and insecticide use to conserve or enhance the action of natural enemies.


2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Dirk Babendreier ◽  
Maolin Hou ◽  
Rui Tang ◽  
Feng Zhang ◽  
Tiangkham Vongsabouth ◽  
...  

Abstract We provide a case study where Integrated Pest Management (IPM) for rice production systems has been introduced to the Greater Mekong Subregion (GMS). Funded by the European Union (EU), this IPM initiative brought together local and international partners to develop an environmentally friendly and economically sustainable rice pest management strategy for southwestern China, Laos, and Myanmar. A key component of the strategy was to establish 12 Trichogramma spp. rearing facilities (TRFs) that mainly targeted rice stem borers. Four TRFs were established in each of the participating countries. The most promising strains of Trichogramma chilonis (Ishii) and T. japonicus (Ashmead) were selected for production in the TRFs based on extensive field surveys as well as laboratory and field release studies. The project also considered the potential for Trichogramma spp. of each strain to withstand the high temperatures expected under a changing climate. Implementation of the IPM strategy resulted in higher rice yields (2–10%), an increase in natural enemy abundance (e.g., twice as many spiders), and a reduction in insecticide applications (1.5 fewer applications). During a capacity-building program, IPM practices with strong cultural and biological control-based components were promoted among ca 50 IPM trainers and ca 6,400 rice farmers. This case study indicates the potential successes of advanced biological control-based IPM systems. We believe that these systems merit wider consideration, including adaptations for other regions and crops.


2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
Peris Wangari Nderitu ◽  
Mattias Jonsson ◽  
Esther Arunga ◽  
Mark Otieno ◽  
John Jamleck Muturi ◽  
...  

Combination of pest management strategies that minimize pesticide use and conserve natural enemies is important for a sustainable environment. Overreliance on synthetic insecticides in the management of Tuta absoluta has led to pesticide resistance leading to difficulties in managing the pest. In this regard, alternative measures need to be put in place to reduce the effects of this pest. The objective of this study was, therefore, to assess the effectiveness of host plant resistance, biological control, and selective insecticides when used in combination, in the management of T. absoluta in tomato production. The study was set up in a greenhouse in a completely randomized design involving two tomato varieties, an insecticide (chlorantraniliprole), and a biological control agent(Macrolophus pygmaeus), applied singly or in combination. Data were collected on T. absoluta damage from the lower, intermediate, and upper leaves. The results from this study show that a combination of insecticide with a moderately resistant variety had a significantly lower T. absoluta damage as compared with a susceptible variety combined with an insecticide. However, the moderately resistant variety when combined with insecticide showed no effect when the biological control agent was added. The susceptible variety significantly reduced T. absoluta damage when combined with the biological control agent. These results indicate that treatment combinations in insect pest management can be utilized. The present study results indicate that using a moderately resistant variety (Riogrande VF) in combination with the insecticide chlorantraniliprole (Coragen®) and a susceptible variety (Pesa F1) in combination with the biological control agent (M. pygmaeus) can improve T. absoluta management. Under good habitat management, the susceptible variety will perform equally as the moderately resistant variety due to suppression of the T. absoluta populations by natural enemies. These findings show the importance of environmental conservation both by enhancing natural enemy abundance and use of selective insecticide in the management of T. absoluta in tomato production. Combinations in this present study are likely to reduce insecticide doses, thereby reducing the cost of production and enhancing environmental compatibility with natural enemies.


2014 ◽  
Vol 1 (2) ◽  
Author(s):  
Mohammad Irshad

The agriculture sector is important in the overall economy of Pakistan. There are many limiting factors in crop production. The two important factors are pest damage and pollination in addition to many others. Pest damage remained a serious problem since the dawn of human civilization. With the advancement of knowledge regarding safety of environment, pests are now tackled through Integrated Pest Management (IPM) techniques. In IPM, biological control through use of natural enemies is quite significant and the favored approach. Pollination is an essential ecosystem service. Effective pollination results in increased crop production, quality improvement and more seed production. One of the important groups of pollinators is Syrphid. About 84 species are reported from Pakistan. However, they have not been practically and effectively applied in both IPM and pollination contexts.


2017 ◽  
Author(s):  
Ryan Rayl ◽  
Stephen Wratten

Historically, handling insects has usually involved their being killed, but non-lethal approaches are necessary when evaluating the biology of such organisms. Anesthesia has been used as one of these non-lethal approaches. Two common anesthetics used in this way have been carbon dioxide and chilling. These have been used frequently in the literature but have sub-lethal effects on insects that may affect further experimentation. An alternative anesthetic that has potential for experimental use is triethylamine (TEA). This shows promise because of its ease of use and potency as an insect anesthetic, but evidence, if any, of the sub-lethal effects is almost non-existent in the literature. Here, longevity was use as a proxy for fitness as this is a common approach to laboratory work of this type for pests and their natural enemies. A series of experiments were carried out to find the optimal rates for these three selected anesthetics. The organism selected for this work was the fly Scaptomyza flava (Fallén), the larvae of which mine the leaves of commercial brassica crops worldwide. It is a ‘cosmetic’ pest in that damage thresholds for crop rejection are very low and prophylactic use of insecticides is the norm. One way of mitigating the negative environmental aspects of this approach is to enhance biological control. One such way of enhancing biological control is the use of flowering plants, as they can provide alternative resources to natural enemies, which can enhance their ability to control pests. To evaluate these flowering plants, handling of the insects is necessary and anesthesia is used for this purpose. For each anesthetic an optimal rate was found, then these rates were compared to each other in a subsequent experiment. These anesthetics differed markedly in their value in terms of the duration of the anesthesia and other practical considerations. TEA had the longest effect, CO2 and chilling had the shortest. All three were similar in their effects on longevity (i.e. recovery time and mortality rates).


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