Identification and biology of two whitefly species on cassava in Sri Lanka

• Autorzy: Kumarasinghe N C , Salim N. , Wijayarathne W.

Warianty tytułu

PL

Badania nad identyfikacja i cyklem rozwojowym dwoch gatunkow maczlika na roslinach manioku w Sri Lance

• Języki publikacji: EN

Abstrakty

EN

A survey in four distant locations: Anuradhapura, Madampe, Sri Jayewardenapura and Uda Walawe of Sri Lanka to identify the whitefly species related to cassava revealed two species, namely Bemisia tabaci (Gennadius) and Alerodicus dispersus (Russell). The species B. tabaci was recorded in all four surveyed locations, while A. dispersus was collected only from the first three locations. The results of the study on the pest life cycle under the laboratory conditions showed that, B. tabaci and A. dispersus passed through four nymphal instars before the adult stage. The mean duration values of these stages were 7.2, 7.5, 4.7, 5.6 and 8.5, 6, 9, 9 days respectively for the two species. The total duration of the life cycle of B. tabaci ranged from 22-57 days at the temperature of 29±2°C with a mean of 37.5 while that of A. dispersus was 27-68 days with a mean of 48 respectively (at 28±2°C). The damage to crop plants caused by two whitefly species is discussed with a special emphasis on their ability to transmit viral diseases.

PL

Badania nad identyfikacją i występowaniem gatunków mączlika na roślinach manioku przeprowadzono w czterech rejonach: Anaradhapura, Madame, Sri Jayewardenapura i Uda Walawe w Sri Lance. Wykazano, że gatunek Bemisia tabaci (Gennadius) występował we wszystkich miejscach objętych obserwacją, natomiast gatunek Alerodicus dispersus (Russell) stwierdzono tylko w trzech pierwszych rejonach. Wyniki obserwacji nad cyklem rozwojowym szkodnika wykazały, że obydwa gatunki, wytwarzały cztery stadia larwalne przed osiągnięciem stadium owada dorosłego. Średnie wartości dla okresu trwania poszczególnych stadiów rozwojowych w przypadku gatunków B. tabaci i A. dispersus wynosiły odpowiednio 7,2; 7,5; 4,7; 5,6 oraz 8,5; 6; 9; 9 dni. Całkowity cykl rozwojowy gatunku B. tabaci przebiegał w granicach 22-27 dni (średnio 37,5) w warunkach temperatury 29±2°C. W przypadku gatunku A. dispersus okres ten był nieco dłuższy i wynosił 27-68 dni (średnio 48), w temperaturze 28±2°C W pracy opisano typy uszkodzeń roślin powodowane przez wymienione gatunki mączlika, ze szczególnym zwróceniem uwagi na zdolności szkodnika do przenoszenia chorób wirusowych.

Słowa kluczowe

PL

white fly; Sri Lanka; Bemisia tabaci; Alerodicus dispersus; pest; life cycle; laboratory condition; cassava; identification

• Wydawca: -
• Czasopismo: Journal of Plant Protection Research
• Rocznik: 2009
• Tom: 49
• Numer: 4
• Opis fizyczny: p.373-377,ref.

Twórcy

autor

Kumarasinghe N C

• University of Sri Jayewardenapura, Nugegoda, Sri Lanka

autor

Salim N.

autor

Wijayarathne W.

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