Factsheet of the month: July 2015 – Prevention of powdery mildew on mango using cultural methods

20157800331The use of pesticides in Ethiopia has been increasing in recent years but it is thought that due to a lack of training and awareness, these chemicals are often being used unsafely and excessively. Many groups in Ethiopia are therefore raising awareness of Integrated Pest Management (IPM) in which control methods are selected based on their economic justification and level of risk to the environment. Cultural control methods do not involve the use of chemical pesticides and so are often less expensive to implement and safer for the environment.

This month’s Factsheet of the Month, ‘Prevention of powdery mildew on mango using cultural methods‘ provides information about using cultural control methods to reduce the incidence of powdery mildew in mango. This factsheet was written by extension experts in Ethiopia last year.

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Mango production in Bangladesh

20157800221According to the Daily Star, mango production in Rajshahi and Chapainawabganj districts in Bangladesh might be hampered by unfavourable weather this year. The farmers are worried as large numbers of fruits, up to 70%, fell from the trees before ripening. Following the attack by leaf hoppers earlier in March, mango trees in that area are now affected by an undiagnosed disease which has symptoms described as mould on leaves. This unconfirmed disease could potentially be caused by powdery mildew (Oidium mangiferae), but reliable pathogen diagnosis is needed before advising management strategies.

For advice on how to prevent and manage mango pests and diseases, such as powdery mildew, anthracnose and mango seed weevil, review the Green Lists hosted on the Plantwise knowledge bank providing cultural and biological management options.

The Green Lists are produced by Plantwise for use by plant doctors and extension workers who provide advice to farmers. To see more about the content held on the Plantwise knowledge bank, please click here.

Update: New Pest & Disease Records (01 Apr 15)

TSWV is one of the viruses detected on chillies in Mexico © Gerald Holmes, Cal Poly via Bugwood
TSWV is one of the viruses detected on chillies in Mexico © Gerald Holmes, Cal Poly via Bugwood

We’ve selected a few of the latest new geographic, host and species records for plant pests and diseases from CAB Abstracts. Records this fortnight include the first report of Alternaria leaf blight disease on oil palm in Thailand, caused by Alternaria longipes, the detection of a virus affecting chilli pepper in Chihuahua, Mexico and the association of Papaya leaf curl virus with the leaf curl disease of grain amaranth in India. 

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Factsheet of the month: August – Sulphur to control powdery mildew in cashew

Sulphur to control powdery mildewLast weekend, a team of experts from the Naliendele agricultural research institute (NARI) held a seminar in Tanzania to present lectures on the prevention and control of pests affecting cashew. Although cashew production in Tanzania has declined since the 1970s, it remains an important cash crop in the coastal regions of the country. The seminar, held in Mkinga District, aimed to bring extensionists and researchers together to promote the exchange of ideas and provide the extension officers with the knowledge to be able to advise farmers on how to improve the health, and therefore the yields, of their cashew crop.

Powdery mildew is the most important disease facing cashews in Tanzania and was the subject of one of the lectures held in Mkinga District. The disease, which is caused by a fungus, causes patches of white powder to appear on the surface of the leaves and other plant parts. To find out about how sulphur can be used in the management of powdery mildew on cashew,  read the Plantwise Factsheet for Farmers created by employees from Mkuranga District Council and the Ministry of Agriculture in Tanzania. This factsheet is also available in Swahili.

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Update: Plant Health News (30 Jul 14)

Farmers in California are diverting water away from vegetable crops to rescue their almond crops from drought © Luigi Chiesa (CC BY-SA)
Californian farmers are diverting water from vegetable crops to save almonds from drought © Luigi Chiesa (CC BY-SA)

Here’s a taste of some of the latest stories about plant health, including the effects of typhoons in Taiwan and China, a new strategy for almond irrigation in California and a crackdown on fake seed sellers in Kenya.

Click on the link to read more of the latest plant health news!
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Which is the most important plant-pathogenic fungus?

Stem rust on wheat - one of the Top 10 plant-pathogenic fungi © Yue Jin (USDA ARS)

A survey by the journal, Molecular Plant Pathology, had 495 responses from international fungal pathologists on what they thought the most scientifically and economically important fungal plant pathogens were. Several of the ‘top 10’ fungi from these results are those that infect cereal crops, which isn’t surprising as cereals such as wheat and rice are some of the most highly produced crops worldwide. Continue reading