June 30, 2020

BRUCHUS RUFIMANUS PDF

Sometimes known as the Broad Bean Weevil (or Broad Bean Beetle). At about 5 mm, this is the largest species in the genus Bruchus. The elytra are grey-brown. Mediterranean pulse beetle – [Bruchus emarginatus] Citation: Walker, K. () Broadbean weevil (Bruchus rufimanus) Updated on 9/2/ Adult emerging from an attacked bean; Bruchus rufimanus Boheman (Coutin R. / OPIE) Damage on field bean seeds The adults emergence holes are visible.

Author: Yojas Vudom
Country: Peru
Language: English (Spanish)
Genre: Science
Published (Last): 26 August 2007
Pages: 225
PDF File Size: 6.41 Mb
ePub File Size: 3.33 Mb
ISBN: 223-7-33362-829-9
Downloads: 37432
Price: Free* [*Free Regsitration Required]
Uploader: Doulabar

Broadbean weevil

Bruchus rufimanuscommonly known as the broad bean weevilbroad bean beetleor broad bean seed beetle is a leaf beetle which inhabits crops and fields, as well as some homes. It is a pest of faba beans Vicia faba L. The adult beetles feed on pollen, while their larvae tunnel in seeds destroying crops and moving on to new ones once they dry out. The broad bean beetle, B. It reproduces in spring in faba bean crops, lays eggs on the young pods, develops in the growing seeds and overwinters as adults in shelters, or in diapause as larva or pupa diapause in the stored seeds.

Adults are in reproductive diapause and overwinter in protected sites such as under tree barks, particularly of old, standing trees, hedgerows, lichen, and in forests [1] or leaf litter. More specifically, a day length of 16h is required for the beetles to terminate their reproductive diapause.

An optimal day length of 18h is found to induce diapause termination. They become sexually mature in a few days, as a result of both an increased duration of photophase and the ingestion of faba bean pollen and nectar Tran and Huignard Adults are extremely mobile during the day, and find refuge in resting sites in flowers and young leaves at night and early morning.

They migrate from crop to crop following flower availability. Field density can vary. Fields near overwintering sites such as woody and herbaceous environment, and storage facilities, present increased risk of B. Once males and females are both sexually mature, mating is spread over a few weeks. Once fertilized, females B.

  IMBINARI LEMN PDF

Ackerbohnenkäfer

Eggs are laid predominantly on the lowest parts of the plant. A maximum of ten eggs per pod is observed. Females lay between 50 and eggs. Rain might increase egg mortality. After about 10 days 1—3 weeks depending on temperatureslarvae hatch and bore directly throughout the pod walls and develop within the seed. Larvae are thus protected from biological and chemical control. Larval development lasts two to three months. Before entering its pupal stage, the larva cuts a circular cap.

After around ten days of pupal stage, the adult emerges from the seeds. Because mating and oviposition are spread over bruchks few weeks, adults can emerge before or after harvest.

In addition, damaged seeds have increased susceptibility to rust and root diseases.

Additionally, the presence of living insects on seeds are an issue for the export market as no living insects are allowed for export. The presence of beetles in the seeds after harvest thereby decreases faba bean commercial value. The larval stages of B. Bruchus rufimanus is most vulnerable at the adult stage. Most control measures have therefore targeted adults either at colonization stage in the field or at emergence in storage facilities.

Control measures have been focused on direct control with insecticides, but restrictions and removal from market due to environmental concerns have increased the need for alternative measures. Because of their larval development inside the seeds which are protected by the pods, most inventorying methods are based on population of B.

Adult population density can be estimated by counts on plants at field colonization. The development semiochemical attractants trapping systems for both monitoring and pest control has received particular interest in ongoing research on the beetle.

In addition, population estimate are difficult to obtain as egg laying is spread over time until 5—10 days after the end of flowering BBCH Alternative methods exist to sort the seeds: Additionally, the end of larval and pupal diapause and therefore the emergence of B. In Europe, pyrethroids and neonicotinoids have been used against B. Because of the faba bean crop biology and its attraction to pollinators at flowering stage, restrictions on pesticides uses have been introduced in Europe.

  KORPORATIVNE FINANSIJE PDF

Bruchus rufimanus Boheman, | UK Beetle Recording

It is particularly advised to spray in absence of pollinators in the early morning and evening. In addition, due to B.

The end of blooming indicates the end of adult activity in the field. This stage is therefore rufimaanus threshold marking the end of insecticide application and occurs no later than five days after last blooming.

Although the measures taken in storage facilities do not decrease the proportion of damaged seeds, they limit the densities of emerging insects and therefore the pressure for the coming year.

Such measures will be especially efficient in storage as most B. Early harvest could therefore be recommended for best control measures in storage facilities. The pressure from B. In addition, sanitation can help decreasing the source of B. Parasitoids have been found to parasitize B.

Chremylus rubiginosus and Triaspis thoracicus family: Braconidaeand Dinarmus acutus family: Their larvae develop into B. Generalist predators on faba bean leaves such as spiders might feed on B. From Wikipedia, the free encyclopedia.

Brychus rufimanus Enlarged view of a broad bean beetle Scientific classification Kingdom: Journal of Insect Physiology.

Bruchidae in a region of Kabylia in Algeria”. African Journal of Agricultural Research. Seed Science and Technology 2. Bruchidae Infestation During Storage”.

Journal of Plant Protection Research. Retrieved from ” https: Bruchinae Beetles described in CS1 German-language sources de Articles with ‘species’ microformats. Views Read Edit View history. In other projects Wikimedia Commons. This page was last edited on 13 Augustat By using this site, you agree to the Terms of Use and Privacy Policy. Bruchus Linnaeus ,