scholarly journals Different Performance of Phthorimaea operculella Zeller (Lepidoptera: Gelechiidae) among Four Potato Tuber Varieties under Laboratory Condition

Insects ◽  
2021 ◽  
Vol 12 (7) ◽  
pp. 580
Author(s):  
Mengdi Zhang ◽  
Junjie Yan ◽  
Abid Ali ◽  
Yulin Gao
Keyword(s):  
Potato Tuber ◽  
Large Scale ◽  
Management Practices ◽  
Adult Stage ◽  
Feeding Preference ◽  
Phthorimaea Operculella ◽  
Pupal Weight ◽  
Larval Performance ◽  
Suitable Host ◽  
Potato Pests

The potato tuber moth Phthorimaea operculella Zeller is one of the most damaging potato pests in the world and is difficult to control as the larvae feed only inside potatoes. Evaluating the effects of performance of P. operculella on different potato varieties may help to facilitate the development of effective pest management practices. In our study, P. operculella reared on potato variety Lishu6 showed strong performance and on Qingshu 9 exhibited the poorest performance, while P. operculella fed on Hezuo 88 and Yunshu 304 performed moderately. Firstly, larval performance of P. operculella fed on Lishu 6 with that on Hezuo 88, Yunshu 304, and Qingshu 9 was compared by using an age-stage two-sex life table. Compared with larvae fed on Lishu 6, those fed on Qingshu 9 exhibited significantly lower survival, with only 5.56% developing to the adult stage. Secondly, the pupal weight experiment showed that the pupae weight of P. operculella feeding on Lishu 6 tubers (0.0123 g) was significantly heavier than that those feeding on Qingshu 9 (0.0102 g) (p < 0.001). Thirdly, female oviposition and larvae feeding preference indicated that females oviposited on Lishu 6 in preference to Qingshu 9 (p < 0.05, p < 0.001). Overall, this study demonstrated that Qingshu 9 is the least suitable host, and planting this variety over a large scale can provide a basis for the next step of P. operculella control.

Tomato fruit size, maturity and α-tomatine content influence the performance of larvae of potato tuber moth Phthorimaea operculella (Lepidoptera: Gelechiidae)

2006 ◽  
Vol 96 (2) ◽  
pp. 173-178 ◽  
Author(s):  
B. Mulatu ◽  
S.W. Applebaum ◽  
Z. Kerem ◽  
M. Coll
Keyword(s):  
Potato Tuber ◽  
Tomato Fruit ◽  
Fruit Size ◽  
Chemical Properties ◽  
Head Capsule ◽  
Phthorimaea Operculella ◽  
Larval Performance ◽  
Potato Tuber Moth ◽  
Fresh Market ◽  
Feeding Site

AbstractVarious physical and chemical properties of host plants influence insect larval performance and subsequent adult fitness. Tomato plants are relatively new hosts to the potato tuber moth, Phthorimaea operculella (Zeller), with the fruit being its preferred feeding site. However, it is unclear how the biochemical and physical properties of tomato fruits relate to potato tuber moth performance. Significant amounts of α-tomatine were detected in maturing green and ripening fruits of cherry (cv. Ceres) and processing (cv. Serio) types of tomatoes whereas none was detected in a fresh market variety (cv. Marglobe), at comparable stages. α-Tomatine is negatively and significantly correlated with development rate (head capsule size) of larvae reared in the fruits of the cherry and processing type tomatoes. Generally, survival, growth and development were significantly superior for larvae reared in the ripening fruits of the fresh market cultivar. At this stage, the fruits of this cultivar are also the largest. Based on these results it is concluded that fruit α-tomatine content, as wellas fruit size and maturity, all affect performance of P. operculella larvae in the fruits of cultivated tomatoes.

scholarly journals Fumigate efficacy of Juniperus foetidissima essential oil and two terpenes against Phthorimaea operculella

2019 ◽  
Vol 65 (2) ◽  
pp. 14-21
Author(s):  
Ghaleb Tayoub ◽  
Malik Alorfi ◽  
Hala Ismail
Keyword(s):  
Solanum Tuberosum ◽  
Essential Oil ◽  
Potato Tuber ◽  
Adult Stage ◽  
Probit Analysis ◽  
Phthorimaea Operculella ◽  
Potato Tuber Moth ◽  
Vegetable Crop ◽  
Air Concentration ◽  
Type Apparatus

Summary Introduction: Potato (Solanum tuberosum L.) is an important vegetable crop in Syria. Potato tuber moth Phthorimaea operculella is the main damaging pest of this crop. Many approaches were tried to control it. Objectives: This study evaluates the insecticidal activity of Juniperus foetidissima essential oil and two monoterpenes against potato tuber moth using fumigation bioassays. Methods: Essential oil was extracted from new plant branches of Juniperus foetidissima using Clevenger-type apparatus. Potato tuber moth Phthorimaea operculella, (adults, eggs, larvae, and pupae) were exposed to different concentrations of the essential oil of Juniperus foetidissima for various periods. The significance of differences between treatments at p<0.05 were evaluated by one-way analysis of variance using the mortality percentages data. The LC50 and LC90 were calculated by Probit analysis. Results: Essential oil vapor with LC50: 0.3 μl/l air was very effective against potato tuber moth at the adult stage. However; adults sensitivity to monoterpenes varied: Nerol caused a 100% mortality at 0.025 μl/l air after 6 h, while the same concentration of citronellol caused 98% mortality. The 0.125 µl/l air concentration of the two compounds caused 100% mortality after 6 h. Conclusion: Results suggest the possibility of using Juniperus foetidissima essential oil as a fumigant to control potato tuber moth infestation in stores.

scholarly journals Potential of Entomopathogenic Nematodes versus Alpha-cypermethrin Against Potato Tuber Moth, Phthorimaea operculella Zeller 1873 (Lep.: Gelechiidae) in Storage Conditions

2021 ◽  
Author(s):  
Laleh Ebrahimi ◽  
Aziz Sheikhigarjan ◽  
Mehran Ghazavi
Keyword(s):  
Potato Tuber ◽  
Similar Efficacy ◽  
Storage Conditions ◽  
Phthorimaea Operculella ◽  
Steinernema Carpocapsae ◽  
Steinernema Feltiae ◽  
Potato Tuber Moth ◽  
Adverse Impacts ◽  
Synthetic Chemicals ◽  
Potato Pests

The potato tuber moth PTM, Phthorimaea operculella, is one of the most economically important potato pests worldwide. In the present study, the potential of Steinernema feltiae and Steinernema carpocapsae for controlling PTM in potato tubers was evaluated compared to alpha-cypermethrin. Steinernema carpocapsae in both concentrations (12.6&times;106IJs and 6.2&times;106IJs) showed a lower number of emerged insects than alpha-cypermethrin (10 mg ai l-1). Alpha-cypermethrin (20 mg ai l-1) showed the highest efficacy against PTM (81.17%), S.carpocapsae (12.6&times;106IJs), and alpha-cypermethrin (10 mg ai l-1) showed similar efficacy (72.53%) while S. feltiae (6.2&times;106IJs) showed the lowest efficacy (39.04%). The results showed that S.carpocapsae in both concentrations and S. feltiae (12.6&times;106IJs) were efficient the same as alpha-cypermethrin (10 mg ai l-1) having no environmental and health adverse impacts issued in the chemical insecticides usage. Both concentrations of alpha-cypermethrin and S. carpocapsae showed the least tuber damage with no significant differences, while it was as high as the control (59.26%) in both concentrations of S. feltiae. This promising finding introduces EPNs as a part of the potato tuber protection program in storage. Accordingly, EPNs can be considered as an appropriate alternative to synthetic chemicals for PTM control without any residue and health problems.

scholarly journals Behavioral and Physiological Plasticity Provides Insights into Molecular Based Adaptation Mechanism to Strain Shift in Spodoptera frugiperda

2021 ◽  
Vol 22 (19) ◽  
pp. 10284
Author(s):  
Muhammad Hafeez ◽  
Xiaowei Li ◽  
Farman Ullah ◽  
Zhijun Zhang ◽  
Jinming Zhang ◽  
...  
Keyword(s):  
Spodoptera Frugiperda ◽  
Evolutionary Biology ◽  
Host Plants ◽  
Molecular Mechanisms ◽  
Fall Armyworm ◽  
Feeding Preference ◽  
Pupal Weight ◽  
Larval Performance ◽  
Valuable Insight ◽  
Adaptation Mechanism

How herbivorous insects adapt to host plants is a key question in ecological and evolutionary biology. The fall armyworm, (FAW) Spodoptera frugiperda (J.E. Smith), although polyphagous and a major pest on various crops, has been reported to have a rice and corn (maize) feeding strain in its native range in the Americas. The species is highly invasive and has recently established in China. We compared behavioral changes in larvae and adults of a corn population (Corn) when selected on rice (Rice) and the molecular basis of these adaptational changes in midgut and antennae based on a comparative transcriptome analysis. Larvae of S. frugiperda reared on rice plants continuously for 20 generations exhibited strong feeding preference for with higher larval performance and pupal weight on rice than on maize plants. Similarly, females from the rice selected population laid significantly more eggs on rice as compared to females from maize population. The most highly expressed DEGs were shown in the midgut of Rice vs. Corn. A total of 6430 DEGs were identified between the populations mostly in genes related to digestion and detoxification. These results suggest that potential adaptations for feeding on rice crops, may contribute to the current rapid spread of fall armyworm on rice crops in China and potentially elsewhere. Consistently, highly expressed DEGs were also shown in antennae; a total of 5125 differentially expressed genes (DEGs) s were identified related to the expansions of major chemosensory genes family in Rice compared to the Corn feeding population. These results not only provide valuable insight into the molecular mechanisms in host plants adaptation of S. frugiperda but may provide new gene targets for the management of this pest.

Sustainable Production of Honeydew and Muskmelon in Western Mexico

HortScience ◽  
1998 ◽  
Vol 33 (3) ◽  
pp. 495d-495
Author(s):  
J. Farias-Larios ◽  
A. Michel-Rosales
Keyword(s):  
Large Scale ◽  
Management Practices ◽  
Glomus Intraradices ◽  
Cultural Practices ◽  
Bare Soil ◽  
Western Mexico ◽  
First Results ◽  
Legume Cover Crop ◽  
Banana Leaves ◽  
Research Show

In Western Mexico, melon production depends on high-input systems to maximize yield and product quality. Tillage, plasticulture, fumigation with methyl bromide, and fertigation, are the principal management practices in these systems. However, at present several problems has been found: pests as sweetpotato whitefly (Bemisia tabaci Gennadius), aphids (Myzus and Aphis), leafminer (Liryomiza sativae); diseases as Fusarium, Verticilium, and Pseudoperenospora, and weeds demand high pesticide utilization and labor. There is a growing demand for alternative cultural practices, with an emphasis on reducing off-farm input labor and chemicals. Our research is based on use of organic mulches, such as: rice straw, mature maize leaves, banana leaves, sugarcane bagasse, coconut leaves, and living mulches with annual legume cover crop in melons with crop rotation, such as: Canavalia, Stilozobium, Crotalaria, and Clitoria species. Also, inoculations with mycorrhizal arbuscular fungi for honeydew and cantaloupe melon seedlings production are been assayed in greenhouse conditions for a transplant system. The use of life barriers with sorghum, marigold, and other aromatic native plants in conjunction with a colored yellow systems traps for monitoring pests is being studied as well. While that the pest control is based in commercial formulations of Beauveria bassiana for biological control. The first results of this research show that the Glomus intraradices, G. fasciculatum, G. etunicatum, and G. mosseae reached 38.5%, 33.5%, 27.0%, and 31.0% of root infection levels, respectively. Honeydew melons production with rice and corn straw mulches shows an beneficial effect with 113.30 and 111.20 kg/plot of 10 m2 compared with bare soil with 100.20 kg. The proposed system likely also lowers production cost and is applicable to small- and large-scale melon production.

Large-Scale Application of Biofiltration Swale Runoff Management Practices

2007 ◽  
Vol 2 (2) ◽  
Author(s):  
William C. Lucas
Keyword(s):  
Large Scale ◽  
Management Practices ◽  
Peak Flow ◽  
Low Impact Development ◽  
Urban Runoff ◽  
Management Model ◽  
Check Dams ◽  
Runoff Reduction ◽  
Impervious Area ◽  
Hydrologic Responses

Retaining rainfall where it lands is a fundamental benefit of Low Impact Development (LID). The Delaware Urban Runoff Management Model (DURMM) was developed to address the benefits of LID design. DURMM explicitly addresses the benefits of impervious area disconnection as well as swale flow routing that responds to flow retardance changes. Biofiltration swales are an effective LID BMP for treating urban runoff. By adding check dams, the detention storage provided can also reduce peak rates. This presentation explores how the DURMM runoff reduction approach can be integrated with detention routing procedures to project runoff volume and peak flow reductions provided by BMP facilities. This approach has been applied to a 1,200 unit project on 360 hectares located in Delaware, USA. Over 5 km of biofiltration swales have been designed, many of which have stone check dams placed every 30 to 35 meters to provide detention storage. The engineering involved in the design of such facilities uses hydrologic modeling based upon TR-20 routines, as adapted by the DURMM model. The hydraulic approach includes routing of flows through the check dams. This presentation summarizes the hydrological network, presents the hydrologic responses, along with selected hydrographs to demonstrate the potential of design approach.

scholarly journals Precision Agriculture for Resource Use Efficiency in Smallholder Farming Systems in Sub-Saharan Africa: A Systematic Review

2021 ◽  
Vol 13 (3) ◽  
pp. 1158
Author(s):  
Cecilia M. Onyango ◽  
Justine M. Nyaga ◽  
Johanna Wetterlind ◽  
Mats Söderström ◽  
Kristin Piikki
Keyword(s):  
Resource Use ◽  
Precision Agriculture ◽  
Large Scale ◽  
English Language ◽  
Management Practices ◽  
Smallholder Farmers ◽  
Management Strategies ◽  
Sub Saharan Africa ◽  
Smallholder Farming ◽  
Sub Saharan

Opportunities exist for adoption of precision agriculture technologies in all parts of the world. The form of precision agriculture may vary from region to region depending on technologies available, knowledge levels and mindsets. The current review examined research articles in the English language on precision agriculture practices for increased productivity among smallholder farmers in Sub-Saharan Africa. A total of 7715 articles were retrieved and after screening 128 were reviewed. The results indicate that a number of precision agriculture technologies have been tested under SSA conditions and show promising results. The most promising precision agriculture technologies identified were the use of soil and plant sensors for nutrient and water management, as well as use of satellite imagery, GIS and crop-soil simulation models for site-specific management. These technologies have been shown to be crucial in attainment of appropriate management strategies in terms of efficiency and effectiveness of resource use in SSA. These technologies are important in supporting sustainable agricultural development. Most of these technologies are, however, at the experimental stage, with only South Africa having applied them mainly in large-scale commercial farms. It is concluded that increased precision in input and management practices among SSA smallholder farmers can significantly improve productivity even without extra use of inputs.

Green Practices Implementation as Prerequisite to Sustain Firm Competitive Advantages

2015 ◽  
Vol 6 (4) ◽  
pp. 34-53
Author(s):  
Kardison Lumbanbatu ◽  
Vincent Didiek Wiet Aryanto
Keyword(s):  
Product Innovation ◽  
Structural Equation ◽  
Large Scale ◽  
Management Practices ◽  
Corporate Image ◽  
Equation Modeling ◽  
Competitive Advantages ◽  
Green Management ◽  
Marketing Performance

Encompassing firms to apply green policy in a holistic management practices are strongly required in order to maintain competitive advantages and experience long-term marketing performance. This current empirical research is aimed to fill the lack of empirical findings and empirical studies on firm's innovative concept. Green-based product innovation, green management practices and green corporate image are presented as the antecedents and postulated as the sources of sustaining firm competitive advantages. A questionnaire-based survey was deployed to collect data from Large Scale Enterprises in Indonesia with Top Management, Operational and Marketing Managers served as respondents. 500 questionnaires were mailed and 388 were valid for further analysis. Data was analyzed by using Confirmatory Factor Analysis (CFA) and Structural Equation Modeling (SEM) via AMOS statistical software. Statistical findings demonstrated that green-based product innovation, green management practices and green corporate image significantly has a positive affect to sustain firm competitive advantages which is led to enhance long term marketing performance. However, green-based product innovation plays insignificant direct relationship on long term marketing performance. This study discusses some managerial implications for enterprises and recommendations on a basis of green implementation.

Mining wastewater management and its effects on groundwater and ecosystems

2014 ◽  
Vol 70 (9) ◽  
pp. 1481-1487 ◽  
Author(s):  
A. Celebi ◽  
S. Özdemir
Keyword(s):  
Risk Assessment ◽  
Best Management Practices ◽  
Large Scale ◽  
Management Practices ◽  
Developed Countries ◽  
International Standards ◽  
Wastewater Management ◽  
Mining Areas ◽  
Mining Wastewater ◽  
The Developed Countries

Large-scale mining activities have a huge impact on the environment. Determination of the size of the effect and monitoring it is vital. In this study, risk assessment studies in mining areas and the effect of mining on groundwater and ecosystems were investigated. Best management practices and risk assessment steps were determined, especially in areas with huge amounts of mining wastewater. The pollution of groundwater and its reaching humans is a risk of major importance. Our study showed, using many cases with different parameters and countries, that the management of mining wastewater is vital. Environmental impact assessments and monitoring studies must be carried out before operation and at the closure of the mine. Policies must be in place and ready to apply. Factors of climate, geology, ecology and human health must be considered over a long period. Currently, only the developed countries are applying policies and paying attention to the risk. International assessments and health risk assessments should be carried out according to international standards.

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