scholarly journals Effect of plant age, temperature and rainfall on Lepidoptera insect pests collected with light traps in a Eucalyptus grandis plantation in Brazil

2005 ◽  
Vol 62 (1) ◽  
pp. 85-90 ◽  
Author(s):  
Fernando Azevedo de Freitas ◽  
Teresinha Vinha Zanuncio ◽  
Jos� Cola Zanuncio ◽  
Patr�cia Marluci da Concei��o ◽  
Maria do Carmo Queiroz Fialho ◽  
...  
Keyword(s):  
Insect Pests ◽  
Eucalyptus Grandis ◽  
Plant Age ◽  
Light Traps

Studies on the sowing date of cotton in the Sudan Gezira: II. The relationship between sowing date of cotton and the incidence of insect pests

1967 ◽  
Vol 69 (3) ◽  
pp. 317-327 ◽  
Author(s):  
L. Razoux Schultz ◽  
J. E. Jackson ◽  
R. C. Faulkner
Keyword(s):  
Insect Pests ◽  
Sowing Date ◽  
Plant Age ◽  
Factorial Experiments ◽  
Sowing Dates ◽  
Low Levels ◽  
Time Of Year ◽  
The Relationship ◽  
Sudan Gezira

In factorial experiments covering a range of sowing dates and insecticide treatments the numbers of fleabeetle, jassid and whitefly on cotton in the Sudan Gezira were shown to be strongly influenced by the date of sowing and the age of the crop.Attack by fleabeetle was most severe on cotton seedlings from July and early August sowings. Few fleabeetle were found on either more mature plants from these sowing dates or on seedlings from later sown cotton.Whitefly numbers were highest on late July and early August sown cotton. Peak numbers were attained attained in late September and October and then fell to very low levels in November irrespective of date of sowing.Jassid numbers were related both to plant age and to time of year, more being found on cotton sown, in July and early August early in the season and on later sown cotton later in the season. The highest numbers were found in November and December at which time populations were higher on cotton sown in mid-August or later than on earlier sown cotton.

scholarly journals Are Yellow Sticky Cards and Light Traps Effective on Tea Green Leafhoppers and Their Predators in Chinese Tea Plantations?

Insects ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 14
Author(s):  
Longqing Shi ◽  
Haifang He ◽  
Guang Yang ◽  
Huoshui Huang ◽  
Liette Vasseur ◽  
...  
Keyword(s):  
Field Experiment ◽  
Open Field ◽  
Insect Pests ◽  
Light Emitting Diode ◽  
Control Measure ◽  
Trapping Efficiency ◽  
Light Traps ◽  
Green Leafhopper ◽  
Exclosure Experiment ◽  
Tea Plantations

In Chinese tea plantations, yellow sticky cards and light traps are increasingly used to control insect pests, especially the tea green leafhopper Empoasca onukii. In this study, a 16-week open-field experiment with daily weather monitoring was designed to test the responses of tea green leafhopper, parasitoids and spiders to yellow sticky cards and three light traps with different wavelengths (covered with sticky cards). An exclosure experiment was also designed to further test the influence of the three light systems (without sticky card) on the same species. The results showed that all three light emitting diode (LED) light traps (white, green and yellow) and yellow sticky cards attracted many more E. onukii male adults than females during the course of the open field experiment, with less than 25% of trapped adults being females. Parasitoids and spiders were also attracted by these systems. Weather variables, especially rainfall, influenced the trapping efficiency. In the exclosure experiment, the population of leafhoppers in the yellow sticky card treatment did not decline significantly, but the number of spiders significantly decreased. The green and white light treatments without sticky cards showed a significant control of E. onukii and no obvious harm to spiders. These results suggest that yellow sticky cards and light traps have limited capacity to control tea green leafhoppers. However, light, especially green light, may be a promising population control measure for tea green leafhoppers, not as killing agents in the traps, but rather as a behavioral control system.

scholarly journals Plant age, crop stage and surrounding habitats: their impact on sucking pests and predators complex in cotton (Gossypium hirsutum L.) field plots in arid climate at district Layyah, Punjab, Pakistan

2022 ◽  
Vol 82 ◽  
Author(s):  
A. Nadeem ◽  
H. M. Tahir ◽  
A. A. Khan
Keyword(s):  
Insect Pests ◽  
Abiotic Factors ◽  
Threshold Level ◽  
Plant Age ◽  
Cotton Field ◽  
Strong Positive Correlation ◽  
Green Lacewings ◽  
Arthropod Predators ◽  
Trap Cropping ◽  
Field Plots

Abstract Sucking pests are major threat to cotton field crop which cause unbearable losses to the crop yield. Aim of the current study was to record seasonal dynamics of major sucking insect pests including whitefly, jassid, thrips and their natural arthropod predators i.e. green lacewings and spiders in cotton field plots. The effects of surrounding field crops on pests’ density and predatory efficiency of predators were also recorded. For sampling and survey of insects, the visual counting was found to be the most efficient method for recording the abundance of insects, trailed by net sweeping and tapping. Whitefly was the most dominant sucking pest found on the vegetative stage of cotton, followed by jassid and thrips. Fluctuated populations of predatory arthropods, spiders and green lacewings were also recorded during whole cropping season however, the densities of pests and predators varied with crop phenology. Spiders’ population was encouraging at both vegetative and flowering stage and also the same trend of jassid and whitefly were observed at both stages of the crop. Surrounding habitats showed non-significant effect on population densities of insect pests and predators. For abiotic factors, the spiders showed strong positive correlation with humidity and temperature. However, green lacewing was only positively correlated with humidity. On the other hand, the populations of whitefly, jassid and thrips showed non-significant correlation with both temperature and humidity. Overall densities of sucking insect pests were found above economic threshold level. The plant age, crop stage and surrounding habitats effect on the population fluctuation of pests as well as the predators’ abundance. The future studies are also warranted to investigate the altered habitats and multiple trap cropping to find out their impact on unattended insect predators and parasitoids in cotton crop.

scholarly journals Seasonal abundance of the most important insect pests of maize and their natural enemies in Egypt

2021 ◽  
Vol 90 (1) ◽  
pp. 27-40
Author(s):  
Hamdy H. Mahmoud ◽  
Soheir F. Abd El-Rahman ◽  
Mohamed Abd El-Moez Mahbob ◽  
Sayeda S. Ahmed ◽  
Sayeda S. Ahmed
Keyword(s):  
Natural Enemies ◽  
Insect Pests ◽  
Plant Age ◽  
Seasonal Abundance ◽  
Simple Correlation ◽  
Weather Factors ◽  
Rhopalosiphum Maidis ◽  
Orius Albidipennis ◽  
Sesamia Cretica ◽  
The Common

The experiment was conducted to study the seasonal abundance of the most important insect pests of maize and its relation with natural enemies and weather factors in Assiut governorate during 2019 and 2020 seasons.The samples were examined from June to September to determine the population of Limothrips cerealium (Haliday, 1836), Rhopalosiphum maidis (Fitch, 1856) and Sesamia cretica Lederer, 1857 and its the associated predators. The population of L. cerealium recorded a peak in the 4th week of July 2019 and the 1st week of August 2020. The highest population of R. maidis occurred in 1st week of September at both seasons. The simple correlation and regression between L. cerealium population and three weather factors were insignificant in both seasons while S. cretica population were found to be significant with R.H%. The population of R. maidis in the 1st season was insignificant negative with temperatures but was significant in the 2nd season. The plant age was more effective than the weather factors on the population of the three insect pests. The common predators were Orius albidipennis (Reuter, 1884) and Scymnus interruptus (Goeze, 1777)which were highly significant with all three insect pests.

scholarly journals Elemente tehnologice de utilizare a capcanelor cu lumină pentru monitorizarea şi combaterea insectelor dăunătoare

2020 ◽  
Author(s):  
Victor Gorban ◽  
◽  
Vasile Voineac ◽  
Valentina Maievschi ◽  
◽  
...  
Keyword(s):  
Insect Pests ◽  
Plant Protection ◽  
Primary Data ◽  
Light Traps ◽  
Short Term ◽  
Protection Measures ◽  
Plant Pest ◽  
Electro Optic ◽  
Forecasting System ◽  
Low Efficiency

Low efficiency of plant protection means is explained by the lack of a centralized forecasting system for the terms to carry out protective measures, lack of modern methods of obtaining primary data for making up reliable short-term forecasts for the development and spread of pests in agricultural agrocenoses. During last years investigations cowering the elaboration of new systems of integrated plant protection became more active by utilization biorational means of plant protection, and electro optic installations. A great attention is accords to elaboration and selection of sources- attractants and new electro optic structures whice must show a high attractively due to a specific irradiation spectrum and, thus, provide a maximum trapping of harmful insects. Application of the light traps is a more perfect method for phenology investigation of many important, in an economic aspect plant pest, and results of insects gathering can by used for elaboration short-term prognoses of insect pests development for rendering more precise the terms for craning out of protection measures. Further the light traps for insect can be used as an independent mean for plant pest combating. In combination with other methods to combat the use of light traps significantly reduces the number of flying pests, and thus caused them harm.

scholarly journals AGE OF Eucalyptus urograndis PLANTATIONS AND OCCURRENCE OF PEST INSECTS

2016 ◽  
Vol 40 (5) ◽  
pp. 885-892 ◽  
Author(s):  
Joana Gabriela Freitas Andrade ◽  
Verissimo Gibran Mendes Sá ◽  
Sara Lodi ◽  
Bruno Spacek Godoy
Keyword(s):  
Insect Pests ◽  
Control Strategies ◽  
Plant Age ◽  
Stand Age ◽  
Eucalyptus Species ◽  
Pest Species ◽  
Eastern State ◽  
Eucalyptus Forest ◽  
Pest Insects ◽  
Occurrence Pattern

ABSTRACT Eucalyptus species are originally from Australia and its plantations is the major forestry activity in Brazil. The Myrtaceae family is widely represented in Brazil, enabling native insects to migrate to Eucalyptus plants. Native herbivorous insects may adapt to the species planted in monoculture with low availability of their natural host plants and natural enemies. Within this context, the differential occurrence pattern of eleven insect pests of Lepidoptera, Coleoptera and Hemiptera orders, from 450 Eucalyptus stands of different ages recorded in 2002 to 2010 in eastern State of Minas Gerais, Brazil was evaluated. Bayesian inference was used for data analyses in hypothesis testing. The probability of occurrence of pest species was estimated using a linear multinomial model, relating their occurrence with the Eucalyptus stand age. Pest occurrence in Eucalyptus stands were linked to plant age, with younger ones being more susceptible to phytophagous insects. That association with chronological plant age may be associated with the resource exploration strategy of each group of pest insects. Thus, Eucalyptus forest management should be adapted to the temporally differential use of the stands by pest species, providing more efficient control strategies.

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