Pubescence in cassava and resistance to both cassava mealybug and green spider mite

By:

Hahn, S.K

Material type: Article

ArticleLanguage: English Description: p. 76Subject(s): LOC classification:

19581

In: In: Okoli, O.O.; Enyinnia, T.; Igbokwe, M.C.; Odurukwe, S.O.; Okeke, J.E.; Okereke, H.E. (eds.). International Workshop on Control of Cassava Mealybug and Green Spider Mite (1981, Umudike, Nigeria). ProceedingsSummary: Se describe brevemente la relacion que hay entre la pubescencia de la yuca y la resistencia al piojo harinoso (Phenacoccus manihoti) y al acaro verde (Mononychellus tanajoa). El International Institute of Tropical Agriculture (IITA) ha adoptado 2 enfoques en Nigeria, mejoramiento por resistencia y control biologico, para encontrar medios para controlar estas 2 plagas. Se evaluo la resistencia a estas plagas de 60 clones de yuca en el IITA (1980-81). La infestacion del campo fue uniforme y se encontraron diferencias significativas en la resistencia prom. de los clones. TMS 60142, 30017, 61342, 60741 y 40764 fueron resistentes a M. tanajoa; TMS 6177, 42025, 60142, 61324 y 4(2)1425 fueron resistentes a P. manihoti. TMS 60142 fue resistente y TMS 4(2)1425 moderadamente resistente a las 2 plagas. Estos 2 clones produjeron rendimientos relativamente altos (15-25 t/ha) en condiciones del IITA, y su calidad fue aceptable. El no. de pelillos/cm de longitud a lo largo de la vena central del enves de las hojas se correlaciono significativamente con la resistencia a P. manihoti y M. tanajoa; tambien hubo relacion entre estas 2 resistencias, lo que sugiere la posibilidad de mayor mejoramiento por resistencia. (CIAT)Summary: The relationship between leaf pubescence of cassava plants and resistance to the cassava mealybug (Phenacoccus manihoti) and to the green spider mite (Mononychellus tanajoa) is briefly discussed. The International Institute of Tropical Agriculture (IITA) has adopted 2 major approaches in Nigeria, breeding for resistance and biological control, to find means of controlling these pests. Sixty cassava clones were tested for resistance to these pests during 1980-81. Field infestation was uniform and significant differences were found in av. clonal resistance. TMS 60142, 30017, 61342, 60741, and 40764 were resistant to M. tanajoa; TMS 6177, 42025, 60142, 61324, and 4(2)1425 were resistant to P. manihoti. TMS 60142 was resistant and TMS 4(2)1425 moderately resistant to both pests. These 2 clones produced relatively high yields (15-25 t/ha) under IITA conditions and their quality was acceptable. The no. of hairs/1 cm length along the mid-rib of leaf undersurface correlated significantly with resistance to P. manihoti and M. tanajoa. There was a relationship between these 2 resistances, suggesting that improvement of cassava for further resistance is feasible. (CIAT)

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Item type	Current library	Collection	Call number	Copy number	Status	Date due	Barcode	Item holds
Book Chapters	CIAT Library Document collection CINFOS	Document Collection CINFOS	19581 (Browse shelf(Opens below))	c.1	Short Loan		100070518

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Se describe brevemente la relacion que hay entre la pubescencia de la yuca y la resistencia al piojo harinoso (Phenacoccus manihoti) y al acaro verde (Mononychellus tanajoa). El International Institute of Tropical Agriculture (IITA) ha adoptado 2 enfoques en Nigeria, mejoramiento por resistencia y control biologico, para encontrar medios para controlar estas 2 plagas. Se evaluo la resistencia a estas plagas de 60 clones de yuca en el IITA (1980-81). La infestacion del campo fue uniforme y se encontraron diferencias significativas en la resistencia prom. de los clones. TMS 60142, 30017, 61342, 60741 y 40764 fueron resistentes a M. tanajoa; TMS 6177, 42025, 60142, 61324 y 4(2)1425 fueron resistentes a P. manihoti. TMS 60142 fue resistente y TMS 4(2)1425 moderadamente resistente a las 2 plagas. Estos 2 clones produjeron rendimientos relativamente altos (15-25 t/ha) en condiciones del IITA, y su calidad fue aceptable. El no. de pelillos/cm de longitud a lo largo de la vena central del enves de las hojas se correlaciono significativamente con la resistencia a P. manihoti y M. tanajoa; tambien hubo relacion entre estas 2 resistencias, lo que sugiere la posibilidad de mayor mejoramiento por resistencia. (CIAT) spa

The relationship between leaf pubescence of cassava plants and resistance to the cassava mealybug (Phenacoccus manihoti) and to the green spider mite (Mononychellus tanajoa) is briefly discussed. The International Institute of Tropical Agriculture (IITA) has adopted 2 major approaches in Nigeria, breeding for resistance and biological control, to find means of controlling these pests. Sixty cassava clones were tested for resistance to these pests during 1980-81. Field infestation was uniform and significant differences were found in av. clonal resistance. TMS 60142, 30017, 61342, 60741, and 40764 were resistant to M. tanajoa; TMS 6177, 42025, 60142, 61324, and 4(2)1425 were resistant to P. manihoti. TMS 60142 was resistant and TMS 4(2)1425 moderately resistant to both pests. These 2 clones produced relatively high yields (15-25 t/ha) under IITA conditions and their quality was acceptable. The no. of hairs/1 cm length along the mid-rib of leaf undersurface correlated significantly with resistance to P. manihoti and M. tanajoa. There was a relationship between these 2 resistances, suggesting that improvement of cassava for further resistance is feasible. (CIAT) eng