Adult pea weevils are speckled brown, with a short, broad snout. They are a vital crop for food security in many parts of the world. Due to COVID-19, our staff is working remotely. Weevil infestations can spread rapidly and lead to significant losses of bean crops. 0000089652 00000 n The results show that biological control of the bean weevil by its natural enemy D. basalis under on-farm conditions can be quite successful. H�b```f``���$�11 �P������ ��X�qIA�����h�a`X�6=�m A single introduction of the parasitoid D. basalis (five males and five females per kg bean seeds) in the first week following harvest resulted in weevil eradication on four farms with a low level of initial infestation. The researchers found three regions of bean DNA important for weevil resistance. The following are some of the most common indications that pea weevils are present: The seed of the host plant will show most of the damage. 0000035495 00000 n 0000108668 00000 n The study also showed that weevil resistance is inherited separately from seed size in beans. Weevil Control on Vegetables. A successful vegetable garden means properly dealing with the presence of pest insects, such as the vegetable weevil (Listroderes costirostris obliquus). Some of the most common host plants of pea weevil include dry bean, faba beans, field pea, and perennial legumes.

Treating seeds with chemicals can be effective but is costly and may carry health risks. These genetic signals act like molecular beacons, allowing the researchers to hone in on regions of bean DNA that are important for weevil resistance.

For each bean plant tested, the researchers calculated the percentage of bean seeds damaged by weevils. Treating seeds with chemicals can be effective but is costly and may carry health risks.

They are packed with nutrients and are high in protein. Finally, the researchers used statistical analyses to find genetic signals–called markers–that are more common in the DNA of bean plants resistant to weevils. 0000008141 00000 n “Being able to indirectly look for resistance with genetic markers will bring efficiency to the breeding process.”. H��T�n�0��+�H1��KTP�5Q`[���(�R�)\4��y �%)�I�CQ���3�;�q��w����N8)�PI �E�_�=��Iº����?��H

In fact, under favorable conditions, weevils can infest entire quantities of stored beans within a few months. 0000014569 00000 n 0000079443 00000 n “They may even store seeds to sell when prices are more favorable.”. CC flickr photo courtesy of janetmck Identification of Pea Weevils. m�rq9ZɜWc�KÙ�^���iVߍR�X=��fڑ"�rR�k�8��GQȔ/Dbe����Ȥ嗴VMg�0&�D�(t�-�K-b+D�ዋz6A-��e��e/Ɠ'S�,)BA�A�fRRŖ%��u̠��Ws6��g {>�zԔP�T�du���F����+�4;�k�ӣ3H_UP��l:���+���c�"4���`�2/�R�y98�}N� �x�uŧ����d��1���zV�Y%�l�)���p���@�U��6����C��. 0000012921 00000 n 0000011122 00000 n 0000013702 00000 n trailer << /Size 106 /Info 41 0 R /Root 43 0 R /Prev 238728 /ID[] >> startxref 0 %%EOF 43 0 obj << /Type /Catalog /Pages 30 0 R /JT 40 0 R /PageLabels 29 0 R >> endobj 104 0 obj << /S 359 /L 524 /Filter /FlateDecode /Length 105 0 R >> stream 0000012186 00000 n 0000004411 00000 n 0000166919 00000 n 0000166681 00000 n “Beans with larger seeds are preferred by consumers in several areas of Africa,” says Kamfwa. 0000008803 00000 n When weevil larvae were present as early instars, parasitoids reduced weevil populations by 88–97%.

@ełG�v&�^ǯ�9�����.����y�Ԩ���7���f;�%$���Yٹ��#P0B/��nCU!�f������N���\z��T���m3�6n��*z]�����G��L߰��Lи �n\Ϻ��Փ�O%�yϚ������q�����q4��`������s�-��̦PaFA3��@��ٿH� �XD�A�a���Q����jw3�2a�e�E�/�Y�����1�0��=z �43C�� � Most of the plants affected are peas, including Pisum fulvum and Pisum sativum. In some areas, farmers currently treat bean seeds with ash from cooking fires to control weevils. 0000167138 00000 n Copyright © 2020 Elsevier B.V. or its licensors or contributors. 0000005685 00000 n 0000001628 00000 n When weevil larvae were present as early instars, parasitoids reduced weevil populations by 88–97%. s5���x$ק!`_��AQ0��C�,6����m�LFv{I�~�W�����;i$c[X|=��w�ԣ��hdP���a|��~/{��ش�Ϟ���K�$m�Pdy�P&Y h��9gֱ9���������'/�_ �y� From this batch of one pound, count out 100 beans. 0000011452 00000 n July 11, 2019 at 11:13 am. 0000024874 00000 n Madison, WI 53711-5801 https://doi.org/10.1016/j.jspr.2004.10.005. They help replenish soil nitrogen levels. “Using bean plants directly to research weevil resistance can be complicated and time-consuming,” says Kamfwa. In this study, we distinguished between farms with low and high levels of infestation at the time of harvest. 0000078982 00000 n 0000001715 00000 n