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Bioecology of the larger grain borer [Prostephanus truncatus Horn]

100%

Pradzynska A.

Journal of Plant Protection Research

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1999

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tom 39

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nr 2

The larger grain borer (Prostephanus truncatus Horn) is one of the most dangerous pests of stored maize in tropical and subtropical countries. The most favourable conditions for reproduction and development of this insect is temperature 26°C and the maize grain with the moisture content 15,1-16,6%. In the dry grain (below 10% of moisture content) its development is not possible.

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Nutritional preferences of the lesser grain borer Rhizopertha dominica F. [Coleoptera, Bostrichidae] under conditions of free choice of food

80%

Klys M.

Journal of Plant Protection Research

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2006

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tom 46

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nr 4

359-367

The subject of this study was Rhizopertha dominica F. population. The primary question referred to was the process of the lesser grain borer population spread depending on nutritional preferences of this species. The aim of performed laboratory experiments was to examine the adults’ ability to choose preferred kinds of food i conditions of free migration among them and to analyze the dynamics of population size. Sex ratio and the migration rate were also analyzed. Four types of food were used during the experiments: wheat, oat flakes, pearl barley and semolina. The experiments were conducted at 28°C and 60 ± 5% of relative humidity. Results of the study revealed that oat flakes were the most favourable nutriment for adult R. dominica whereas wheat grain was the most favourable for the population size since larvae were protected by grains and thus their increased number could survive. No population development in semolina was observed. It was the result of too small granulation of this food.

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An influence of lowered temperature on the migration activity of the population of Rhizopertha dominica F. [Coleoptera, Bostrichidae]

80%

Klys M.

Journal of Plant Protection Research

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2009

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tom 49

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nr 3

263-266

The subject of the study was the lesser grain borer Rhizopertha dominica F. — a dangerous pest of stored grain. The study was carried out in the laboratory at a temperature of 31°C, the optimal temperature for this species, and also in the temperature lowered to 22°C and 60±5% relative humidity. The main aim of the research was to investigate the migration activity of R. dominica in lowered temperature. In addition the population dynamics, mortality and sexual ratio in a population of R. dominica were also analyzed. It was shown that lowering the temperature to 22°C caused an increase in the migration activity of R. dominica in the initial phase of infesting a new habitat. A larger migration and mortality of females were observed. In addition, the population growth was slow and prolonged in time at the temperature of 22°C as compared to the optimal temperature. Lowering the temperature did not influence the mortality of the R. dominica population.

Ograniczanie wyników

3 Journal of Plant Protection Research

2 Klys M.

1 Pradzynska A.

1 2009

1 2006

1 1999

Bioecology of the larger grain borer [Prostephanus truncatus Horn]

Nutritional preferences of the lesser grain borer Rhizopertha dominica F. [Coleoptera, Bostrichidae] under conditions of free choice of food

An influence of lowered temperature on the migration activity of the population of Rhizopertha dominica F. [Coleoptera, Bostrichidae]