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- W2087842404 abstract "Abstract The cassava mealybug (CM), Phenacoccus manihoti Mat.‐Ferr., is a dry season pest of cassava, Manihot esculenta Crantz. Its effects on the patterns of dry matter production and allocation in cassava planted July, September 1982 and May 1983 and grown for 12 months was studied. Peak CM population densities varied greatly (from 600 to 37000 CM per plant) due to plant size at the time of infestation, duration of infestation, and mortality from the introduced parasitoid Fpidinocarsis lopezi (De Santis). CM feeding reduced new leaf production and assimilation and allocation of dry matter to storage roots. Severly infested cassava plants, lost between 9 % and 46 % during the dry season, compared to CM‐free plants. At the beginning of the ensuing rainy season, mobilisation of reserves from storage roots for regrowth caused temporary root yield losses of up to 75%. Yield losses at harvest across planting dates measured 12 months after planting, were of 52 to 58 % in the CM‐infested plants compared to noninfested plants. Zusammenfassung Zum Einfluß des Befalls von Phenacoccus manihoti Mat.‐Ferr. (Horn., Pseudococcidae) auf die Manihot esculenta‐Ernte Phenacoccus manihoti tritt während der Trockenzeit als Schädling an Manihot esculenta Crantz auf. Der Einfluß des Befalls und die Verbreitung von P. manihoti in Abhängigkeit vom Pflanzzeitpunkt (Juli, September 1982, Mai 1983) wurde untersucht. Die maximale Populationsdichte von P. manihoti variierte stark (600–37 000 pro Pflanze) in Abhängigkeit von der Pflanzengröße zum Befallszeitpunkt, der Befallsdauer und der durch den Parasitoiden Epidinocarsis lopezi (De Santis) bedingten Mortalität. Durch P. manihoti ‐Fraß wurden die Bildung neuer Blätter, die Assimilationsleistung und die Trockensubstanz in den Speicherwurzeln reduziert. Der Verlust betrug 9–46 % während der Trokkenzeit. Zu Beginn der Regenzeit, wenn die Reservestoffe aus den Speicherwurzeln für den Wiederaustrieb gebraucht werden, betrug der Ernteverlust bis zu 75%. Wurden die Ernteverluste der verschiedenen Pflanzzeitpunkte 12 Monate nach der Pflanzung ermittelt, so ergab sich im Vergleich zu P. manihoti ‐freien Pflanzen ein Verlust von 52–58%." @default.
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- W2087842404 date "1991-01-12" @default.
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- W2087842404 title "The influence of the cassava mealybug,<i>Phenacoccus manihoti</i>Mat.-Ferr. (Horn., Pseudococcidae) on yield formation of cassava,<i>Manihot esculenta</i>Crantz" @default.
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- W2087842404 doi "https://doi.org/10.1111/j.1439-0418.1991.tb00306.x" @default.
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