The emerging problem in cereal crops in North-Eastern Tunisia: The cereal leaf beetles Oulema spp. (Coleoptera; Chrysomelidae; Criocerinae) dynamic populations and infestation rate

The economic importance of the leaf beetles and their distribution according to the groups of damaged plants: forests and other sylvan plantations, cereal crops, fruit trees and berry plants, perennial herbage, vegetables, medicinal herbs and vine is presented in this thesis. Only 19 of the above species are harmful for plants, the others cause insignificant damage or they are indifferent.

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Applying a computer program, based on a developed mathematical model, to protect cereal crops from leaf beetles (Oulemaspp.)

Archives of Phytopathology and Plant Protection ◽

10.1080/03235408.2010.490394 ◽

2011 ◽

Vol 44 (13) ◽

pp. 1238-1247

Author(s):

Felicyta Walczak

Keyword(s):

Mathematical Model ◽

Computer Program ◽

Cereal Crops ◽

Leaf Beetles

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Dynamics of leaf beetles density (Coleoptera, Chrysomelidae) in grain crops agrocoenoses of the Samara Region

Samara Journal of Science ◽

10.17816/snv201872119 ◽

2018 ◽

Vol 7 (2) ◽

pp. 94-102

Author(s):

Sergey Ivanovich Pavlov ◽

Andrey Stepanovich Yaitsky

Keyword(s):

Economic Value ◽

Weather Conditions ◽

Steppe Zone ◽

Cereal Crops ◽

Forest Steppe ◽

Left Bank ◽

Leaf Beetles ◽

Grain Crops ◽

Oulema Melanopus ◽

Local Species

The author studied winter and spring wheat (Trticum) development dynamics in the Volga Region left-bank forest-steppe zone during 1974-2010 in natural conditions and gardens on the Samara Region cereal crops fields, as well as generation cycles of 6 local species of leaf beetles, with 1-year development, 5 of which do a lot of harm to wheat ( Oulema melanopus L., Phyllotreta vittula Redt., Chaetocnema aridula Gyll., Chaetocnema hortensis Geoffr., Hispella atra L.) and 1 ( Cassida rubiginosa Mll.) is the consumer of a weed plant - Cirsium arvense (L.) Scop.). The author also studied leaf beetles density dynamics and their localization on grain crops of different age. The author studied cereal crops agrocoenoses microclimate under different weather conditions, different plants vegetation intensity at different times of the day. The author also studied major stages of beetles harmful species generation and the timing of their implementation. The paper contains an analysis of the extent and timing of different harmfulness of leaf beetles; the economic value of their separate types. The author surveyed the conditions preferred by the pests of wheat as well as the factors depressing their larval stage and considered the cases of beetles and larvae massive aggregations formation and beetles migration into more comfortable areas. The author comes to the conclusion of the extraordinary plasticity and adaptability of the leaf to the microclimatic conditions of the habitat.

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Comparative germination patterns of annual grasses in north-eastern Victoria

Australian Journal of Experimental Agriculture ◽

10.1071/ea9700401 ◽

1970 ◽

Vol 10 (45) ◽

pp. 401 ◽

Cited By ~ 20

Author(s):

AA McGowan

Keyword(s):

Seasonal Distribution ◽

Cereal Crops ◽

Late Winter ◽

Annual Grass ◽

Lolium Rigidum ◽

Winter Cereal ◽

North Eastern ◽

Annual Grasses ◽

Hordeum Leporinum ◽

Bromus Mollis

The seasonal distribution of germination of Lolium rigidum, Vulpa bromoides, Hordeum leporinum and Bromus mollis was measured under field conditions. The study was conducted in north-eastern Victoria from February to August in 1966 and 1967. Although 49-97 per cent of seed of all species had germinated by the end of April, the proportions of Lolium and Volpia that emerged after April (36 and 45 per cent respectively) were greater than the analogous proportions of Hordeum and Bromus (18 and 13 per cent respectively). These differences in germination pattern are considered to be of potential importance in explaining the incidence of annual grass weeds in winter cereal crops, but of little significance explaining the persistence of these grasses in grazed pastures. Less th-an one per cent of the original seeds remained viable on or in the soil by late winter.

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Environment features and protective behavior of chortobionts and dendrobionts species of leaf beetles (Coleoptera, Chrysomelidae)

Samara Journal of Science ◽

10.17816/snv201984111 ◽

2019 ◽

Vol 8 (4) ◽

pp. 65-74

Author(s):

Sergey Ivanovich Pavlov ◽

Andrey Stepanovich Yaitsky ◽

Farit Talgatovich Miniyarov

Keyword(s):

Weather Conditions ◽

Significant Degree ◽

The Body ◽

Protective Behavior ◽

Leaf Beetles ◽

Physiological Adaptations ◽

North Eastern ◽

Forest Belts ◽

Active Motor ◽

Wind Flows

During 1974-2016, the protective behavior of 14 background species of leaf beetles (Coleoptera, Chrysomelidae) was studied within the Central and North-Eastern areas of the Samara Region: 7 - inhabitants of open areas and 7 - dendrobionts. During the 40-year period of the research, fine measurements of the microclimate of the grassland of steppes, meadows, ruderal vegetation and agrocoenoses, as well as forest stands, stakes and forest belts on 18 similar parameters were carried out. The qualitative microclimatic components of the boundaries of motor activity of insects in the environment of their typical habitats are determined; the rhythm and dependence of leaf eaters on the weather conditions of the natural environment are estimated; the types of protective adaptations, series of behavioral manifestations under the action of abiotic and biotic (mainly predators) agents of the environment are elucidated. The modes of the dominant effects on the body - the level of illumination, humidity regime, the strength of wind flows are revealed. Adaptations, passive and active motor protective reactions of leaf beetles in response to the action of 3 types of influences are considered. It has been found that for species existing in a certain climatic continuum there is a significant degree of tolerance to environmental factors prevailing in this biotope. In addition to the real protective motor reactions in the active phases of leaf beetles there is a whole system of congenital morphological and physiological adaptations that allow insects to experience many negative environmental influences.

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