New solution to prevent citrus disease

Over the past few years, green veins and root rot disease have caused great damage to gardeners with thousands of hectares, mainly oranges and tangerines. Recently, many scientific agencies have come up with effective solutions, helping farmers to effectively detect, treat and prevent these two dangerous diseases.

PRC technique

The Biotechnology Research and Development Institute (Can Tho University) introduced the PRC (Polymerase Chain Reaction) technique to diagnose green tendon yellowing disease, which helps to detect the disease early in a few days after the plant is infected. disease, prevent spread in nurseries, orchards.

The technique was carried out according to the process: taking a leaf sample with yellow speckled leaves or young leaves and extracting DNA from the veins, reacting with solutions in the experiment set (Kit) to run PCR. Finally, use electrophoresis to detect bacteria. If the sample of citrus leaves is infected, there will be characteristic signs on the electrophoresis spectrum.

To apply this technique, growers can take leaf samples to the Institute at any time, to take immediate measures, instead, it takes 1-3 years after planting trees as before.

Intercropped guava with oranges and tangerines

The Southern Fruit Research Institute has also successfully tested intercropping guava in citrus orchards, limiting psyllids, aphids and aphids, causing yellow veins and reverse ripening for plants. Through experiment, guava is intercropped with clean orange seedling plant by the method of growing a guava tree, planting an orange tree next to the distance of 1.5m, this item is 1.5m away from the other. With the density of planting 60 orange trees and 60 guava trees on an area of ​​1,000m2, in 16 months orange leaves young leaves 6 times, no psyllids, aphids appear in the garden, lush oranges are not sick, due to Guava leaves "have special qualities" to chase away hoppers, so they hardly appear in the orange garden. While, in plots without guava, more or less psyllids and aphids appear.

This way of intercropping, in addition to the effect of chasing the two types of hoppers above, also helps increase the coverage of the soil, limiting weeds. In addition, guava trees intercropped after 8 months for fruit, gardeners can pick and sell for short term.

Use Trico probiotics

The Department of Agriculture (Can Tho University) has also launched the product containing Trichoderma mushroom (trade name is Trico - CTU) , which has the function of preventing and treating root rot on orange, tangerine by Fusarium, Phytophthora mushrooms. induced (root, stem and fruit rot), while also being able to cure fungal pink fungus Corticium salmonicolor. How to prevent and treat plant diseases is to hoe the soil to create a circular groove around the canopy, for organic residues such as plant residues, decomposed animal manure . and spray the drug containing Trichoderma mushroom on the trench. One week later add lime to increase soil nutrition. From 10 - 15 days later, apply chemical fertilizers (with NPK ingredients) at a ratio of 1-3-2 to help plant roots recover quickly. About 45 days later, fruit trees will grow young roots. In the next 3 months, the tree will recover, yellow leaves and normal fruit. Inoculants also work to decompose plant residues fast, help increase nutrition for plants.

Many farmers in Lai Vung district (Dong Thap) and Tam Binh (Vinh Long) have used hundreds of hectares of citrus trees, resulting in greening disease of green veins and rotting yellow leaves recovering more than 70%. Currently, this composition has been approved for circulation by MARD and is officially included in the citrus IPM process by the Southern Plant Protection Center.