BUD ROT DISEASE ON PINEAPPLE

Bud rot disease  on pineapple is common and harmful in most pineapple growing areas, especially in pineapple growing areas in the northern provinces. All pineapple varieties are affected by this disease, but resistant varieties cause less damage. In general, this is one of the dangerous diseases on pineapple trees, causing top rot, fruit rot, and . plant death, causing loss of density and yield.

**Symptoms: The disease usually arises in pineapple buds, because this is a humid place due to stagnant water and dirt from rain or fog... is an ideal condition for fungal growth. When the plant is diseased, the leaves will turn green, yellow, red, and the tips of the leaves will shrink. Looking at the top, we see that the pineapple bud is rotten black brown. Diseased leaves are easily removed from the top of the plant. The base of the diseased leaves has streaked black-brown edges and wet rot. Pineapple buds are rotten and milky white.

* Pathogens and conditions of development:

- Pineapple bud rot disease caused by Phytophthora sp fungus

- The disease develops strongly in the months with hot and humid weather, with a lot of rain or wind, or with a lot of fog and humidity. The disease also thrives in gardens with high density, poor drainage, excess nitrogen fertilization, but lack of potassium, calcium and microelements, gardens with many suckers such as aphids, gardens with many weeds, density ...

*Preventive measures:

- Clean up the remnants of previous crops and wild plants around the garden before planting

- Use disease resistant varieties for planting. Treat seedlings before planting with ALPINE 80WG to eliminate disease sources.

- Plant with appropriate density, do not plant too thick.

- Manage water well, especially in the rainy season.

After harvesting, clean the garden, prune diseased plants and destroy them to avoid spreading in the garden, apply lime to disinfect and improve soil pH.

- Always keep the garden clean of weeds so that the garden is well ventilated.

- Fertilize in a reasonable balance, avoid excess nitrogen, and add organic fertilizers. Increased use of SPC-K, SPC-CAL and TANO-601 to increase disease resistance.

-It is recommended to use preparations with antagonistic Trichoderma fungi to apply with fertilizer.

- The treatment of fruit stimulants continuously weakens the tree and reduces its resistance. Therefore, it is necessary to consider the health of the garden and have a suitable investment regime before handling.

-When the disease appears in the field, use the following products: ALPINE 80WG, or TREPPACH BUL 607SL, or DIPOMATE 430SC. It is recommended to combine each of the above products with SK ENSPRAY 99EC mineral oil to increase the retention of products and prevent the penetration of fungi. It is possible to prevent right from the beginning of the rainy season to save money on prevention.

-After the pineapple growing cycle ends, the land should be rotated with other crops such as rice, sugar cane, and legumes… to cut off the source of the disease.