scholarly journals Population Density of The Tortoise Beetle, Cassida vittata, Vill. (Coleoptera: Chrysomelidae) and The Role Predators on Sugar Beet at El-beheira Governorate

2016 ◽  
Vol 7 (4) ◽  
pp. 265-272
Author(s):  
S. Askar
Keyword(s):  
Population Density ◽  
Sugar Beet ◽  
Tortoise Beetle

The First Record of Tortoise Beetle Damage to Sugar Beet in the UK: Is Global Warming Responsible?

2021 ◽  
Vol 32 (4) ◽  
pp. 158-161
Author(s):  
Alan M. Dewar ◽  
Tim Martin
Keyword(s):  
Sugar Beet ◽  
Western Europe ◽  
First Record ◽  
Point Of View ◽  
Crop Damage ◽  
International Institute ◽  
Tortoise Beetle ◽  
Beetle Damage ◽  
Sugar Beet Crop ◽  
The Uk

The authors thought they had experienced everything that the sugar beet crop could throw at them from a pest point of view after almost 40 years of working with the sugar beet industry. It was therefore very exciting to be confronted with a highly unusual pest this summer, so unusual that its presence in high numbers causing significant damage to a sugar beet crop in Norfolk in August 2021, is the first record of such damage in the UK. The pest was the exotic tortoise beetle, Cassida nebulosa, which the sugar beet bible, Pests, Diseases and Disorders of Sugar Beet, published by the International Institute de la Recherches Betteraves (IIRB), describes as rare, and never important in northern Europe. Indeed, this species has never, in our memory, been recorded before as a pest in sugar beet in the UK, only a very rare presence. Dewar and Cooke (2006) stated in their review of pest problems in sugar beet the UK, that crop damage by tortoise beetles never occurs in western Europe, but can be severe in warmer Mediterranean regions and in Russia.

scholarly journals Trichogramma entomophage in integrated plant protection as means to reduce pests’ population density on annual crops

2018 ◽  
pp. 248-255
Author(s):  
L. Gavrilita
Keyword(s):  
Population Density ◽  
Sugar Beet ◽  
Plant Protection ◽  
Agricultural Crops ◽  
Biological Efficacy ◽  
Annual Crops

During the 2000 to 2017 years average biological efficacy after 4 and respectively 6 treatments with Trichogramma on annual crops such as cabbage, corn, tomatoes, peas, sugar beet and soybean varied in the first variant from 74% to 90.0% whereas in the second variant varied from 60% to 76%. Pests attack on agricultural crops researched varied from 2% to 10%, after Trichogramma launching. In the untreated field, the same index varied from 16% to 90%.

scholarly journals Population density and soil seed bank of weed beet as influenced by crop sequence and soil tillage

2010 ◽  
Vol 56 (No. 11) ◽  
pp. 541-549 ◽  
Author(s):  
M. Landová ◽  
K. Hamouzová ◽  
J. Soukup ◽  
M. Jursík ◽  
J. Holec ◽  
...  
Keyword(s):  
Population Density ◽  
Sugar Beet ◽  
Crop Rotation ◽  
Seed Bank ◽  
Soil Seed Bank ◽  
Spring Barley ◽  
Reproductive Potential ◽  
Late Summer ◽  
Soil Tillage ◽  
Beet Root

Dynamics of population density and soil seed bank of weed beet was studied in a 5 year crop rotation consisting of spring barley, and sugar beet. Beside the crop rotation experiment, the seeds of weed beet were studied for their dormancy and viability in soil seed bank over the period of four years. The obtained data indicates that weed beet was able to produce seeds only in sugar beet, but not in barley. In sugar beet, its reproductive potential allows weed beet to restore and increase the soil seed bank of glomerules rapidly. Common infestation of sugar beet is able to persist over more than the 2-year period between repeated introductions of sugar beet in crop rotation. The experiment has also proven the negative effect of weed beet presence on sugar beet yield. The sugar beet root yield decreased of 0.4 t/ha with every 1000 weed beet plants per hectare. The yearly loss of viable seeds was about 75%. The number of surviving seeds decreased exponentially in time. Less than 2% of seeds remained viable after three years in the soil. Seasonal fluctuations of seed dormancy were observed. Seeds were dormant in autumn, lost dormancy in winter and recovered it in late summer.

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