Limits...
Comparative Demography of the Spider Mite, Tetranychus ludeni , on Two Host Plants in West Africa

View Article: PubMed Central

ABSTRACT

It is well recognized that the quality of host plants affects the development and survival of plant-feeding arthropods. The effects of two leafy vegetable crops, amaranth, Amaranthus cruentus L. (Caryophyllales: Amaranthaceae) and nightshade, Solanum macrocarpon L. (Solanales: Solanaceae) were examined on the development and demographic parameters of the spider mite, Tetranychus ludeni Zacher (Acari: Tetranychidae). This mite was recently identified as a pest of the two leafy vegetables which are widely used in West Africa. The experiments were conducted at the International Institute of Tropical Agriculture, Benin, West Africa, in a growth chamber at 27°C, 70% ±10% RH and 12:12 (L:D). Immature development of T. ludeni was shorter on A. cruentus than on S. macrocarpon, whereas female longevity was the same on the two vegetable crops. Total fecundity per female was higher on A. cruentus than on S. macrocarpon, largely due to longer survival of adult female T. ludeni on the former; however, no differences were observed in the daily fecundity of T. ludeni on the two plant species. The comparison of intrinsic rates of natural increase (rm), the net reproductive rates (Ro) and the survival rates of adult stage of T. ludeni on the two vegetable crops suggests that T. ludeni performs better on S. macrocarpon than on A. cruentus. Reasons for the lower rate of population growth observed on amaranth should be studied in more details as this could be used in IPM strategies such as intercropping to reduce pest density and in developing biopesticides for use against T. ludeni in vegetable farms in Africa.

No MeSH data available.


Female production as a function of age of reproductive T. ludeni females feeding on the two host plants. Bars represent standard errors of the means.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC2990336&req=5

f02: Female production as a function of age of reproductive T. ludeni females feeding on the two host plants. Bars represent standard errors of the means.

Mentions: The temporal fluctuations of the percentage of female progeny (Figure 2) against the age of parents showed that the proportion of females in the progeny was overall higher on S. macrocarpon, than on A. cruentus. The production of females seems constant on S. macrocarpon with a trough only on day 19, followed immediately by a rapid increase at the end of the experiment. On A. cruentus, the production of females showed an overall decreasing trend with a trough around day 11 after which it reached a peak before decreasing, starting from day 16 to the end of the experiment.


Comparative Demography of the Spider Mite, Tetranychus ludeni , on Two Host Plants in West Africa
Female production as a function of age of reproductive T. ludeni females feeding on the two host plants. Bars represent standard errors of the means.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC2990336&req=5

f02: Female production as a function of age of reproductive T. ludeni females feeding on the two host plants. Bars represent standard errors of the means.
Mentions: The temporal fluctuations of the percentage of female progeny (Figure 2) against the age of parents showed that the proportion of females in the progeny was overall higher on S. macrocarpon, than on A. cruentus. The production of females seems constant on S. macrocarpon with a trough only on day 19, followed immediately by a rapid increase at the end of the experiment. On A. cruentus, the production of females showed an overall decreasing trend with a trough around day 11 after which it reached a peak before decreasing, starting from day 16 to the end of the experiment.

View Article: PubMed Central

ABSTRACT

It is well recognized that the quality of host plants affects the development and survival of plant-feeding arthropods. The effects of two leafy vegetable crops, amaranth, Amaranthus cruentus L. (Caryophyllales: Amaranthaceae) and nightshade, Solanum macrocarpon L. (Solanales: Solanaceae) were examined on the development and demographic parameters of the spider mite, Tetranychus ludeni Zacher (Acari: Tetranychidae). This mite was recently identified as a pest of the two leafy vegetables which are widely used in West Africa. The experiments were conducted at the International Institute of Tropical Agriculture, Benin, West Africa, in a growth chamber at 27°C, 70% ±10% RH and 12:12 (L:D). Immature development of T. ludeni was shorter on A. cruentus than on S. macrocarpon, whereas female longevity was the same on the two vegetable crops. Total fecundity per female was higher on A. cruentus than on S. macrocarpon, largely due to longer survival of adult female T. ludeni on the former; however, no differences were observed in the daily fecundity of T. ludeni on the two plant species. The comparison of intrinsic rates of natural increase (rm), the net reproductive rates (Ro) and the survival rates of adult stage of T. ludeni on the two vegetable crops suggests that T. ludeni performs better on S. macrocarpon than on A. cruentus. Reasons for the lower rate of population growth observed on amaranth should be studied in more details as this could be used in IPM strategies such as intercropping to reduce pest density and in developing biopesticides for use against T. ludeni in vegetable farms in Africa.

No MeSH data available.