scholarly journals Dampak Tanaman Transgenik Bt terhadap Populasi Serangga Pengendali Hayati

2016 ◽  
Vol 1 (2) ◽  
pp. 76
Author(s):  
Bahagiawati A. Husin
Keyword(s):  
Transgenic Plants ◽  
Transgenic Plant ◽  
Natural Enemies ◽  
Plant Resistance ◽  
Field Experiments ◽  
Insect Pests ◽  
Plant Resistance To Insects ◽  
Sequential Experiments ◽  
Genetic Engineering Technology ◽  
The Impact

<p class="p1">An alternative technique to improve plant resistance to insect pests is plant transformation using the genetic engineering technology. Several transgenic plants resistant to insect have been produced and commercially released to environment in some industrial and developing countries. Before release, transgenic plants need to be assessed for their potential risks to human health and environment. One of the environmental risk assessments is the potential risk to non-target insects, including the biocontrol insects. Laboratories, glasshouse, and field experiments have been conducting the study of the impact of transgenic plant resistance to insect, especially transgenic Bt plants to the population of predators and parasitoids. However the results were controversial. The objective of this review is to inform some of controversial results, and to suggest serial experiments need to be done to solve the problem. The impact of the transgenic plant resistance to insects depends on several factors, such as genes that are used to transform the plants, the kind of plant pests, and the kind and stages of the insect natural enemies. Results of the experiments were influenced by sites of the experiments (laboratory, glasshouse, or field) and contact of the natural enemies to the toxin. Some experiments showed that the transgenic Bt plants have no impact to the natural enemies population, and otherwise. Due to the controversial results, the experiment and assessment should be done in depth and carefully studied. A sequential experiments need to be adopted to avoid the misleading interpretation, and the assessment need to be based on a case by case study.</p>

scholarly journals Impact of Intercropping Sorghum and Okra on the Incidence of Flea Beetles of Okra Podagrica spp in Dalwa, Maiduguri Semi-Arid Zone of Nigeria

2014 ◽  
Vol 14 ◽  
pp. 51-58
Author(s):  
M.M. Degri ◽  
I.B. Richard
Keyword(s):  
Field Experiments ◽  
Insect Pests ◽  
Arid Zone ◽  
Flea Beetle ◽  
Fruit Weight ◽  
Fruit Yield ◽  
Leaf Damage ◽  
The Impact ◽  
Fruit Formation ◽  
Semi Arid

Field experiments were conducted at faculty of Agriculture teaching and research farm, university of Maiduguri in 2010 and 2011 rainy seasons. The aim was to investigate the impact of intercropping sorghum with okra on the incidence of flea beetle of okra (Podagrica spp) in the semi-Arid zone of Nigeria. The results showed that sole crop okra suffered flea beetle attack which affected its growth, fruit formation, fruit weights and fruit yield. Intercropping okra with sorghum significantly reduced the flea beetle populations, leaf damage caused by Podagrica spp (Coleoptera: Chrysomelidae). While increasing number of leaves for photosynthetic activities, plant height, fruit formation, fresh fruit weight and total fruit yield. The study concluded that okra intercropping at 1:1, 1:2 and 2:2 are the most efficient and productive intercrop systems in flea beetle management. Okra intercropping with cereal sorghum was found to be good for sustainable agriculture and organic farming in Nigeria due to its numerous advantages, particularly with respect to insect pests’ control.

scholarly journals The impact of cotton plant resistance on spider mites and their natural enemies

Hilgardia ◽  
1986 ◽  
Vol 54 (5) ◽  
pp. 1-20 ◽  
Author(s):  
Paul J. Trichilo ◽  
Thomas F. Leigh
Keyword(s):  
Cotton Plant ◽  
Natural Enemies ◽  
Plant Resistance ◽  
Spider Mites ◽  
The Impact

Host plant resistance in grain crops and prospects for invertebrate pest management in Australia: an overview

2008 ◽  
Vol 48 (12) ◽  
pp. 1543 ◽  
Author(s):  
H. Gu ◽  
O. R. Edwards ◽  
A. T. Hardy ◽  
G. P. Fitt
Keyword(s):  
Transgenic Plants ◽  
Pest Management ◽  
Host Plant ◽  
Plant Resistance ◽  
Host Plant Resistance ◽  
Insect Pests ◽  
Agricultural Systems ◽  
Grain Crops ◽  
Complementary Role ◽  
Invertebrate Pests

An integrated pest management (IPM) approach that relies on an array of tactics is adopted commonly in response to problems with pesticide-based production in many agricultural systems. Host plant resistance is often used as a fundamental component of an IPM system because of the generally compatible, complementary role that pest-resistant crops play with other tactics. Recent research and development in the resistance of legumes and cereals to aphids, sorghum midge resistance, and the resistance of canola varieties to mite and insect pests have shown the prospects of host plant resistance for developing IPM strategies against invertebrate pests in Australian grain crops. Furthermore, continuing advances in biotechnology provide the opportunity of using transgenic plants to enhance host plant resistance in grains.

scholarly journals Using flower strips to promote green lacewings to control cabbage insect pests

2021 ◽  
Author(s):  
Rafael Alcalá Herrera ◽  
Belén Cotes ◽  
Nuria Agustí ◽  
Marco Tasin ◽  
Mario Porcel
Keyword(s):  
Natural Enemies ◽  
Habitat Management ◽  
Insect Pests ◽  
Floral Resources ◽  
Choice Test ◽  
Beneficial Arthropods ◽  
Borago Officinalis ◽  
Green Lacewings ◽  
Cabbage Pests ◽  
The Impact

AbstractHabitat management improves biological control by increasing the abundance and fitness of natural enemies through the provision of floral resources along field edges or between crops. Among the natural enemies reliant on flower resources, green lacewings often stand out due to their abundance, predation capacity and polyphagy. We evaluated the impact of tailored flower strips on the enhancement of natural enemies, especially green lacewings, in three organic cabbage (Brassica oleracea) farms in Southern Sweden. Insects were sampled from the flower strips, and cabbage pests and predators were visually recorded in the crop. In a laboratory assay, the pollen feeding preferences of Chrysoperla carnea (Stephens, 1836) were evaluated in a dual-choice test. The pollen consumed by the Chrysopidae was extracted from laboratory and field specimens, then quantified and identified. Flower strips were found to attract predators and parasitoids, whose abundance increased as flowers bloomed. Cabbage plants next to the flower strips showed lower pest infestation as compared to cabbage plant control, although no significant differences were observed in the number of predators. Chrysopidae used flower strips as feeding, reproduction and shelter sites and mainly consumed pollen from Phacelia tanacetifolia Benth. Under laboratory conditions, C. carnea showed a preference for P. tanacetifolia and Coriandrum sativum L. pollen over Borago officinalis L. and Fagopyrum esculentum Moench. We show that tailored flower strips could be an efficient tool for enhancing beneficial arthropods and should be considered in integrated pest management for cabbage crops.

Increase of numbers of cereal aphids by insecticide application as an aid to plant breeding

1981 ◽  
Vol 96 (3) ◽  
pp. 703-705 ◽  
Author(s):  
H. J. B. Lowe ◽  
Lydia A. D. Benevicius
Keyword(s):  
Plant Breeding ◽  
Natural Enemies ◽  
Plant Resistance ◽  
Host Plant Resistance ◽  
Insect Pests ◽  
Screening Methods ◽  
Cereal Aphids ◽  
Promising Technique ◽  
Insecticide Application ◽  
Aphid Predators

Increase of pest populations to abnormal levels following application of pesticides is a well-known phenomenon which has been turned to advantage in work on host-plant resistance to insect pests. For example, increases in numbers of aphids followed treatment of potato with carbaryl (Sevin), DDT and other chemicals which killed aphid predators (Peterson, 1963) and carbaryl has been used where enhancement of populations of Myzus persicae was achieved deliberately (Radcliffe & Lauer, 1971; Tingey & Van de Klashorst, 1976). Interest in the possibility of breeding for resistance to cereal aphids, especially Sitobion avenae (F), has increased as more examples of differences between varieties have been reported (e.g. Kolbe, 1969; Hinz & Daebeler, 1974; Lowe, 1978, 1980; Stokes, Lee & Wratten, 1980). This aphid occurs sporadically in the field and natural enemies, notably predaceous and parasitic insects, may contribute significantly to this variation (Vickerman & Wratten, 1979), so the use of insecticides to reduce the effects of the latter appears a promising technique in the development of reliable field screening methods for plant breeding.

scholarly journals Effects of Bt-Cry1Ah1 Transgenic Poplar on Target and Non-Target Pests and Their Parasitic Natural Enemy in Field and Laboratory Trials

Forests ◽  
2020 ◽  
Vol 11 (12) ◽  
pp. 1255
Author(s):  
Pu Wang ◽  
Hui Wei ◽  
Weibo Sun ◽  
Lingling Li ◽  
Peijun Zhou ◽  
...  
Keyword(s):  
Natural Enemy ◽  
Field Experiments ◽  
Populus Deltoides ◽  
Insect Pests ◽  
Mortality Rates ◽  
Transgenic Poplar ◽  
Hyphantria Cunea ◽  
Transgenic Poplars ◽  
Genetic Engineering Technology ◽  
Chouioia Cunea

Increasing areas of artificial afforestation and poplar monoculture in China have led to serious problems with insect pests. The development of genetic engineering technology, such as transgenic modification with Bacillus thuringiensis (Bt) genes, provides novel solutions to the pest problem. We generated a Bt-Cry1Ah1 gene incorporating codon optimization and transferred it into Populus deltoides × P. euramericana cv “Nanlin895” using an Agrobacterium-mediated method. The resulting Bt-Cry1Ah1 transgenic poplars were planted in the field with permission from the State Forestry Administration in 2017. Field and laboratory studies were conducted in Jiangsu, China, to investigate the effects of these transgenic poplars expressing the Cry1Ah1 protein on target and non-target pests and their parasitic natural enemy. Target pests included Hyphantria cunea (Lepidoptera, Arctiidae), Micromelalopha troglodyta (Lepidoptera, Notodontidae), and Clostera anachoreta (Lepidoptera, Notodontidae). Plagiodera versicolora (Coleoptera, Chrysomelidae) served as the non-target pest. Laboratory trials showed that the six transgenic poplar lines exhibited resistance against the target insects. The corrected mortality rates of the target pest larvae fed leaves from the six lines were as high as 87.0%, significantly higher than that of the control. However, the corrected mortality rate of the non-target pest larvae was markedly lower and did not differ significantly from that of the control. Field experiments showed that transgenic poplar exhibited resistance against H. cunea and M. troglodyta. Field mortality rates were slightly higher than laboratory mortality rates. In addition, we investigated Chouioia cunea (Hymenoptera, Eulophidae) as a parasitoid of H. cunea pupae that had been fed transgenic poplar leaves. The emergence time, parasitism rate, and abundance of C. cunea did not differ significantly from those of the control. Therefore, Bt-Cry1Ah1 transgenic poplar can be used to effectively control damage by target insect pests without negatively affecting non-target insects and parasitoids.

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 Modelling the Impact of Key Pests of Watermelon on its Performance Using Linear Regression Models

2021 ◽  
Vol 18 (7) ◽  
Author(s):  
Emmanuel OKRIKATA ◽  
Emmanuel Oludele OGUNWOLU ◽  
Ngozi Ifeoma ODIAKA
Keyword(s):  
Linear Regression ◽  
Regression Models ◽  
Field Experiments ◽  
Insect Pests ◽  
Block Design ◽  
Coefficient Of Determination ◽  
Linear Regression Models ◽  
Crop Performance ◽  
Student’S T ◽  
The Impact

Despite the economic, health, and nutritional values of watermelon, insect pests remain a key limitation to its production globally. However, there has, hardly been any research that has statistically modeled the impact of insect pests on its performance. Therefore, this study aims to determine the relationship between the performance of watermelon and the density of its key pests with the aid of correlation and linear regression models, thereby presenting models for forecasting crop performance vis-à-vis pest density for optimum pest management. Data were collected from 40 m2 plots grouped into 4 replicates (10 plots/replicate) in field experiments (arranged in a randomized complete block design) in the early- and late-sown crops of 2016 and 2017 in the Research Farm of Federal University, Wukari, Nigeria. Plant survival rate (%) negatively and significantly (P ≤ 0.05) correlated with each of mean number leaf-feeding beetles (r = −0.80, R2 = 63.5 %, Y = 92.023 – 3.145x; r = −0.79, R2 = 62.1 %, Y = 95.986 – 5.975x), A. gossypii density (r = −0.67, R2 = 44.9 %, Y = 184.048 – 50.444x; r = -0.65, R2 = 42.4 %, Y = 131.852 – 14.618x), and B tabaci density (r = −0.67, R2 = 45.2 %, Y = 188.832 – 11.138x; r = −0.66, R2 = 43.3 %, Y = 178.738 – 3.701x) in both the early- and late-sown crop of 2016, respectively, with a similar trend in those of 2017. All parameters significantly (P ≤ 0.05) fitted the linear regression model. Densities of all major pests consistently correlated negatively and significantly with fruit yield. Student’s t-test detected significant differences between the early- and late-sown crops of both years. We therefore conclude that watermelon experiences multiple pest infestations whose compositions and intensities vary between seasons, and that their influence on agronomic performance, as shown by the coefficient of determination (R2) values (which were indicative of the reliability of the models with respect to the effect of pests on crop performance), were largely close or > 50 %.

scholarly journals Silica nanoparticles as pesticide against insects of different feeding types and their non-target attraction of predators

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Ahmed F. Thabet ◽  
Hessien A. Boraei ◽  
Ola A. Galal ◽  
Magdy F. M. El-Samahy ◽  
Kareem M. Mousa ◽  
...  
Keyword(s):  
Natural Enemies ◽  
Faba Bean ◽  
Field Experiments ◽  
Insect Pests ◽  
Germination Percentage ◽  
Choice Test ◽  
Rove Beetles ◽  
Cotton Leafworm ◽  
Growing Seasons ◽  
Serpentine Leafminer

AbstractThe agricultural use of silica (SiO2) nanoparticles (NPs) has the potential to control insect pests while the safety and tritrophic effects on plants and beneficial natural enemies remains unknown. Here, we evaluate the effects of silica NPs on insect pests with different feeding niches, natural enemies, and a plant. Silica NPs were applied at different concentrations (75–425 mg/L) on field-cultivated faba bean and soybean for two growing seasons. The faba bean pests, the cowpea aphid Aphis craccivora and the American serpentine leafminer Liriomyza trifolii, and the soybean pest, the cotton leafworm Spodoptera littoralis, were monitored along with their associated predators. Additional laboratory experiments were performed to test the effects of silica NPs on the growth of faba bean seedlings and to determine whether the rove beetle Paederus fuscipes is attracted to cotton leafworm-infested soybean treated with silica NPs. In the field experiments, silica NPs reduced the populations of all three insect pests and their associated predators, including rove beetles, as the concentration of silica NPs increased. In soybean fields, however, the total number of predators initially increased after applying the lowest concentration. An olfactometer-based choice test found that rove beetles were more likely to move towards an herbivore-infested plant treated with silica NPs than to a water-treated control, suggesting that silica NPs enhance the attraction of natural enemies via herbivore-induced plant volatiles. In the laboratory, while silica NPs inhibited the development of faba bean roots at 400 mg/L, they did not affect germination percentage, germination time, shoot length, or vigor index compared to the control.

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