| Titre : |
Biology and population dynamics of sorghum head bug Calocoris angustatus in India |
| Type de document : |
texte imprimé |
| Auteurs : |
I.G. Hiremath, Auteur |
| Année de publication : |
1995 |
| Importance : |
p 81-90 |
| Langues : |
Anglais (eng) |
| Catégories : |
SCIENCES AGRICOLES
|
| Mots-clés : |
BIOLOGIE SORGHO CALOCORIS ANGUSTATUS INDE PUNAISE DES PANICULES |
| Résumé : |
The head bug Calocoris angustatus is a key pest of sorghum in parts of India. Nymphs and adults suck the juice from milk grain and reduce the quality and quantity of grain. The duration of egg and nymphal stages is 4.2-11.0 and 9.5-12.5 days. Adult longevity is 11.2-17.2 days (male) and 12.2-23.5 days (female). The insect completes 16 generations in a year. Temperature adversely affects the nymphal period (r=-0.97) and adult longevity (r=-0.98) but not survival of nymphus (r=-0.29). The optimum temperature for development ranges from 25° to 30°C. Fecundity varies from 65 to 276 eggs. Cannibalistic and predatory behavior of the head bug and its preference for various hosts is discussed.
The sorghum head bug is active throughout the year except for a few weeks in summer, although the computed seasonal indices are higher in Aug (190-230), Sept (220-240) and Oct (230-250) during the rainy season and in Jan (200-220) during the postrainy season which coincides with the milk stage of the crop. Among abiotic factors, temperature exerts negative pressure (r=-0.35) whereas relative humidity favors population buildup (r=0.45). Late sowing (15 Jul-15Aug)also favors population buildup. Biotic factors that reduce population levels include spiders, reduviid bugs, ants, mantids, erythraeid mites and an entomogenous fungus, Cephalosporium sp. Their role in the population dynamics of this insect pest is discussed.
|
| Numéro du document : |
A 96000/H00 |
| Niveau Bibliographique : |
2 |
| Bull1 (Theme principale) : |
PROTECTION DES VEGETAUX |
| Bull2 (Theme secondaire) : |
RAVAGEURS DES PLANTES |
Biology and population dynamics of sorghum head bug Calocoris angustatus in India [texte imprimé] / I.G. Hiremath, Auteur . - 1995 . - p 81-90. Langues : Anglais ( eng)
| Catégories : |
SCIENCES AGRICOLES
|
| Mots-clés : |
BIOLOGIE SORGHO CALOCORIS ANGUSTATUS INDE PUNAISE DES PANICULES |
| Résumé : |
The head bug Calocoris angustatus is a key pest of sorghum in parts of India. Nymphs and adults suck the juice from milk grain and reduce the quality and quantity of grain. The duration of egg and nymphal stages is 4.2-11.0 and 9.5-12.5 days. Adult longevity is 11.2-17.2 days (male) and 12.2-23.5 days (female). The insect completes 16 generations in a year. Temperature adversely affects the nymphal period (r=-0.97) and adult longevity (r=-0.98) but not survival of nymphus (r=-0.29). The optimum temperature for development ranges from 25° to 30°C. Fecundity varies from 65 to 276 eggs. Cannibalistic and predatory behavior of the head bug and its preference for various hosts is discussed.
The sorghum head bug is active throughout the year except for a few weeks in summer, although the computed seasonal indices are higher in Aug (190-230), Sept (220-240) and Oct (230-250) during the rainy season and in Jan (200-220) during the postrainy season which coincides with the milk stage of the crop. Among abiotic factors, temperature exerts negative pressure (r=-0.35) whereas relative humidity favors population buildup (r=0.45). Late sowing (15 Jul-15Aug)also favors population buildup. Biotic factors that reduce population levels include spiders, reduviid bugs, ants, mantids, erythraeid mites and an entomogenous fungus, Cephalosporium sp. Their role in the population dynamics of this insect pest is discussed.
|
| Numéro du document : |
A 96000/H00 |
| Niveau Bibliographique : |
2 |
| Bull1 (Theme principale) : |
PROTECTION DES VEGETAUX |
| Bull2 (Theme secondaire) : |
RAVAGEURS DES PLANTES |
|
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