Abstract. Elaeidobius kamerunicus Faust (Coleoptera: Curculionidae), the pollinating weevil, is the most efficient insect pollinator of oil palm, Elaeis guineen -. Abstract. Elaeidobius kamerunicus Faust (Coleoptera: Curculionidae), the pollinating weevil, is the most efficient insect pollinator of oil palm, Elaeis guineensis. The pollination of the oil palm is assured mainly by the insects. The most effective are Elaeidobius kamerunicus and Elaeidobius plagiatus. Declining.

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When the weevils crawl over the male inflorescences a large amount of pollen grains are dispersed which are carried by wind Ponnamma et al.

The average pollen load of weevils visiting female inflorescences ranged fromand represented only During the period after the introduction of the weevil into Malaysia, there was no significant change on bunch parameters, with one exception: All anthesising female inflorescences at the time of population sampling were marked and the fruit bunches which formed were later harvested for analysis.

For the first elaeicobius years, yields oscillated, declines being coupled with lowering of bunch numbers and increases with increased bunch numbers. Therefore, before this age, artificial pollination is required.

BoxKuala Lumpur, Malaysia. Of the various species of this genus studied in Cameroon, E. Besides the low rate of fruit setting, sometimes lack of adequate pollination also results in bunch failure. Fruit detachment from the bunch was delayed as a result of pollinating weevil introduction Chairani and Taniputra, Ann Jose ankara escort.

Oviposition takes place after anthesis so that the larvae develop on tissue which has served its purpose and no longer has any function for the palm and, therefore, Elaeidobius species cause no significant damage. Close Find out more. The critical threshold of weevil numbers required for pollination could not be determined because the fruit set had not declined to low levels.

The population of the weevil was less than elaeidobiud The pollinating weevil, E. Syed estimated that during the period of receptivity, over beetles visit each female inflorescence and that each beetle carries up to pollen grains.


African oil palm weevil

Control methods are not appropriate for E. The increase in yield was due to an increase in the average bunch weight, although the bunch number decreased.

Cosmopterygidae as well as to examine their effects on oil palm bunches. In field studies at kamerunicjs Bukit Sentang Estate in Sumatra, Indonesia, the yield of fresh fruit bunches increased in the first year after the release of E. The pollen carrying capacity increased with the day of anthesis, being maximum during the third to fifth days of anthesis. This is normally carried out by hand. It appeared that the weevil did not change the monthly yield pattern.

File:Elaeidobius kamerunicus.jpg

High elasidobius fruit bunch yields in resulted in the production of a low crop innumbers of bunches being lower, although bunch size was still high. At the onset of monsoon the temperature dropped down and humidity increased, which caused congenial conditions for the weevil multiplication and development.

kqmerunicus When they crawl or move about on the spikelets the pollen grains adhere to their body and during their subsequent visits to the female infloresences the pollen grains are deposited in the stigma of female flowers. The occurrence of biotic factors especially during summer months could cause severe setback on efficiency and development of pollinating weevil coupled with abiotic factors.

The change in numbers of fruit set affects the harvesting standards used for optimizing oil production, as these are based on numbers of loose fruits. M of the day and the peak was observed during Compiled by Palm Elaeidoobius Centre. The weevils were taken to Sabah in March,with even more impressive results.

Furthermore, a high population was not necessarily elaeidobjus because it resulted in the lowering of fruit set. Within a year it had spread throughout the Peninsula and was extremely abundant in all plantations.


The main rat species in the oil palm estates, R. The pollen carrying capacity of males was significantly greater than that of females, which was partially due to the greater surface area of males and especially the presence of pleural setae. Pharmaceutical Sciences Journals Ann Jose ankara escort. October, November and December months were found to be ideal for the development of the weevil.

The correlation between weevil activity and weather parameters viz.

File:Elaeidobius – Wikipedia

Go to distribution map During the second year production fell because the bunch number was still decreasing, in spite of a slight increase in the average weight. It is estimated that the yield at Bukit Sentang Estate will return to the level of the pre-weevil period Taniputra, Publication Policies and Ethics.

There was also a steady build-up of R. The inflorescences which reached anthesis were 6. Andhra Pradesh to find out the influence of weather factors on pollinating weevil, Elaeidobius kamerunicus Curculionidae: Can’t read the image? The weevils were active during 8.

A mill survey revealed that the large compact bunches were difficult to process with the existing machinery, resulting in reduced extraction rates of oil.

In these countries, the inadequacy of pollination has been a major problem. Freed of competition with other species of Elaeidobius, it breeds in all parts of the male inflorescence and is equally common in all rainfall zones.

Pollination studies initiated at Pamol, Sabah in Decemberindicated that there may be a seasonal trend in the population of E.

This is to ensure that we give you the best experience possible. Among the pesticides sprayed at recommended doses against insect pest control fipronil, acetamiprid, thiamethoxam, monocrotophos, L-cyhalothrin, cypermethrin and deltamethrin caused negative impact on population growth and development.