Fungicide for Fruit Farmers

Nordox 50 WP is the only copper fungicide in the Philippines that contains cuprous oxide as its active ingredient. Manufactured by Nordox AS of Norway, a leading producer of high-quality cuprous oxide for use in agrochemicals, Nordox also kills bacteria, breaking up the resistance of these pathogens and disrupting the buildup of disease in areas with a history of infection.

Compared to other copper-based fungicides with either copper oxychloride or copper hydroxide as active ingredient, Nordox has the least particle size of 1.2 microns. The other two fungicides’ particle sizes are 1.8 and 2.5, respectively. The effectivity of a copper fungicide in controlling fungi does not depend on the number of applications per area or the quantity applied, but on how long plants retain it. The longer the retention period, the higher the effectiveness in controlling pathogens.

Nordox’s fine particle size results in more uniform dispersion when mixed in water, giving it more surface contact, longer adherence time, thus better protection. Aside from particle size, insolubility is another favorable Nordox characteristic. The other two copper fungicides are more soluble and release too many cupric ions that can damage the leaves of plants.

The recommended mixing rate of two grams of Nordox in a regular knapsack sprayer load of 16 liters of water also results in relatively cheaper applications. In the rainy months, farmers even double their savings because Nordox doesn’t need a sticker to make it stay on plants if it rains right after spraying.

Rice farmers who use Nordox mix a half-kilo of the powder per hectare to the granular fertilizers that they apply basally. They do so again when farmers sidedress their crops. Nordox prevents rice diseases such as Bacterial Leaf Blight, Sheath Blight, Bacterial Leaf Streak, Cercospora Leaf Spot, and Bakanae. In vegetables, commercial growers follow ABC agronomists’ recommendation to both mix the powder with their fertilizers and use it in sprayable solutions. Especially for seedbeds to prevent soil-borne fungal and bacterial infections.

Recently, other farmers found that the product is also efficacious in fruit farms. In Aurora, for instance, papaya growers in Baler, Ma. Aurora and San Luis towns plant the fruit crop in less than 100 hectares, but that hectarage is fast expanding because of the fruit’s excellent market demand. Red Lady papaya is the main variety they grow.

“We’re now the top papaya producer in Central Luzon,” says Provincial Agriculturist Adriano Necesito. “Buyers who bring our papaya mainly to Baguio and Metro Manila say they prefer it because of its quality.” He adds that they pay special attention to papaya because of its versatility and good marketability.

But as expected, the rainy season and typhoons pose problems for the papaya growers. “Every farmer knows papaya plants cannot tolerate waterlogging and strong winds,” says Necesito. “Rain splash, windblown rain and very wet soil cause diseases, such as foot or stem rot, which nearly destroyed most of our fruiting papayas last month. Most of our growers were panicking because they had tried everything and used different fungicides to no avail. I advised them to apply Nordox Fungicide.”

Necesito instructed the farmers to mix three grams of Nordox in 16 liters of water, spray the lesions on the papaya trunks and drench the soil around their base. He told the growers to brush a stronger mixture directly on larger lesions liberally.

“The effect of Nordox on our papaya plants was immediately noticeable,” said Necesito. “The lesions healed, with the small ones drying up faster, although some growers lost a few of their trees because they didn’t report the infection as soon as they noticed it, or kept on using other fungicides that were not effective.”

In Kasibu, Nueva Vizcaya’s top citrus producing town, Alfonso Namujhe Jr., the pioneer and leading grower, has also benefitted from the protection that Nordox offers. Namujhe grows seedless Satsuma and Ponkan sweet orange varieties in 15 hectares of land in Kasibu’s Binogawan and Malabing barangays. The age of his trees range from 5 to nearly 20 years.

His major fungus-caused problem was Pink Disease. Starting in the topmost branches, the bark of infected trees turned pinkish then black. If not immediately cut off, infected branches would multiply and cause the trees to wither and die. Namujhes’ daughter, Josephine, found a way to control the disease. A Plant Pathology graduate of the University of the Philippines at Los Baftos, she had farm workers spray the infected trees and those immediately around them with a solution containing Nordox, which is also used in mango plantations to control anthracnose.

“That solved the problem, which may be endemic to Kasibu, since we strictly do not use planting materials from elsewhere,” says Namujhe, who serves as consultant of the Malabing Valley Multi-Purpose Cooperative whose more than 300 members also grow Satsuma and Ponkan. “As soon as we notice topmost branches’ bark starting to turn pinkish, we prune them off and spray the entire tree with the Nordox solution. As a result, Pink Disease has become easy for us to control and is no longer a big problem.”

author: Tony A. Rodriguez, extracted from, photo from

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