Mango bloom hopper 08/12/2021

MSc Huynh Kim Ngoc

Mango bloom hopper is a common pest when mango is in the blooming stage and young fruit. In a short time, with favorable conditions, hoppers can break out into epidemics. The hopper lays eggs, sucks bloom and stalks, causing the bloom to dry and fall off, in addition, the sap from the sting, plus the waste of the hopper on the leaves, blooms, and branches create favorable conditions for sooty mold to grow. cover the leaf surface, affecting photosynthesis.

Mango bloom hopper is subject to quarantine in Australia. In Vietnam, there are many types of mango bloom hopper, a species of Idioscopus niveoparsus lays eggs on young leaves and blooms, while species of I.clypealis lays eggs mainly on bloom. Mango bloom hopper has a greenish-brown color, a rounded head, and a wedge-like body. Newly hatched larvae are about 0.5 mm long, light brown yellow, two red eyes. The adults are 4-5 mm long, greenish brown in color. Adults can flip, jump, fly short distances, flexible mobility. Therefore, when the population of hoppers is high, at night you can hear the rustling movement of hoppers on the tree. The female hopper lays 100-200 eggs. The eggs are laid one by one, milky white, laid shallow in the soft parts of the bloom, floral stalks, leaf veins, and young shoots. Egg incubation time is 5-6 days. Larval stage 1 to 4 years old: 10-15 days. Life cycle is about 16-21 days. Both larvae and adults suck on floral sap, young leaves... But they cause damage mainly on blooms.

 

Mango bloom hopper (I.niveoparsus)

Mango bloom hopper appears all year round, lives in the cracks of the dtree, often appears after a drought and increases in density rapidly when the mango produces young leaves , blooming, reaching the highest density when the mango blooms ,then, on a bloom can have many litters. After fruit formation and development, the number of hoppers decreases.

 

Natural enemies of mango bloom hopper are many types such as spiders, ladybugs, egg parasitized wasp Eulophids, Mymarids, ants, parasitic fungi Verticilium, Hirsutella, Beauveria.

To effectively control the mango bloom hopper, it is necessary to apply integrated measures such as:

1. Do not plant thickly.

2. Do not over-fertilize nitrogenous fertilizers, balanced fertilization in NPK

3. After harvesting, it is advisable to prune branches, clean the garden for ventilation to help limit the accumulation of hoppers and cause harm.

4. Light trap: 1-2 weeks before blooming.

5. The stage of mango is about to bloom, if a hopper is detected, even though the density is low, it can be sprayed with specific insecticides against hoppers that inhibit molting with active ingredients such as Buprofezin: Butyl 40WG, Butyl 400SC due to the inhibitory effect on molting so the product is highly effective at killing hoppers, lasts a long time, little damage to natural enemies. If the number of hoppers is high, it can be sprayed periodically every 7-10 days, it is necessary to spray carefully, adjust fine nozzle so that product comes into contact with the hoppers. In addition to Butyl, other specific products can be used such as Comda 250EC (Emamectin benzoate 5 g/l + Petroleum spray oil 245g/l); Brimgold 200WP (Dinotefuran: 50g/kg + Imidacloprid: 150g/kg), Sagometro 50WG (Pymetrozine 50% w/w). Attention should be paid to alternate spraying to avoid product resistance.

 

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