Fighting witchweed in african sorghum

DEVELOPMENT REPORT 1 Made by Falco Fighting Witchweed in African Sorghum Written by Jerilyn Watson This is the VOA Special English Development Report.. Every year it causes six to seve

DEVELOPMENT REPORT 1

Made by Falco

Fighting Witchweed in African Sorghum

Written by Jerilyn Watson

This is the VOA Special English Development Report

Farmers in Africa call the striga plant by the name witchweed It grows a pleasant looking purple flower But it attacks many crops in the grass family Witchweed is among the few flowering weeds that act as parasites on other plants

Every year it causes six to seven billion dollars in damage to African grain sorghum Sorghum is important to the local food supply The witchweed steals water and nutrients from the roots and attacks the sorghum with a poisonous substance

Now, scientists say they have produced seeds that can protect sorghum crops from witchweed

Kassim Al-Katib is a weed expert at Kansas State University in the United States Mitch Tuinstra is a genetics and plant-breeding expert formerly at Kansas State but now at Purdue University in Indiana

To deal with witchweed, they developed special sorghum-seed genes These genes can accept carefully chosen chemical herbicides without being harmed The researchers placed the herbicides on the sorghum seeds Kassim al-Katib said the seeds kill the witchweed as the sorghum grows

Mitch Tuinstra directed greenhouse tests of the seeds in the Netherlands in two thousand five and two thousand six Similar studies took place in field trials in Mali and Niger These studies showed the treatment

to be highly successful

Mitch Tuinstra recently returned from Africa, where he met with agriculture experts They are working to develop local kinds of sorghum that employ the genes The project is a collective research program under the United States Agency for International Development

Witchweed has another unusual quality It requires chemical signals from sorghum seeds to grow If no sorghum seeds are present, the witchweed seeds can lie under the soil for years The seeds begin to grow only when they receive the needed chemical signals

Witchweed seed capsules can hold four hundred to five hundred seeds Winds and rain spread the parasite The plant can reduce a farmer's crop Or it can completely destroy many hectares of grain Witchweed is very difficult to remove after it invades an area

Damage from the parasite is worst in dry soil with low fertility It often strikes farmers who work the poorest land This can mean disaster for people who already do not have enough to eat

And that's the VOA Special English Development Report, written by Jerilyn Watson

A sorghum field infested with striga,

or witchweed