THRIPS CAUSING DAMAGE ON CITRUS TREE (SCIRTOTHRIPS DORSALIS) 21/06/2023

 THRIPS CAUSING  DAMAGE ON CITRUS TREE (SCIRTOTHRIPS DORSALIS) 10/06/2016

 

 In recent years, the area of citrus has been expanded because it is a fruit tree with high economic efficiency. However, in order to sell at a high price, not only in quality but consumers also require the external beauty of the fruit, so pest management on citrus is a matter of great concern to farmers. The hot season is a favorable condition for thrips to develop and cause damage, affecting the commercial value of fruit.

a. Morphological characteristics:

There are two species of thrips present on citrus, Scirtothrips dorasalis and Thrips sp, but the most common is Scirtothrips dorasalis. Thrips belong to the family Thrippidae, order Thysanoptera.

- Adult thrips are very small, about 0.8-1mm long, yellow-orange wings, on both sides of the wings there are many small long hairs.

- Eggs are very small, oval, pale yellow.

- Newly hatched thrips have a transparent body, very small, long legs, pointed abdomen, no wings. At the age of 02, the larvae are similar in size to the adults.

- The pre-pupa stage is yellow, clearly showing two wing buds. The pupa is dark yellow, the eyes are red, and the antennae are short.

b. Biological characteristics and harmful effects:

-The life cycle of thrips is about 15-20 days. The pupal stage is about 3 to 4 days.

-After 3 days of flying out of the cocoon ,female begins to lay eggs. A female can lay 20-25 eggs.

- Thrips damage citrus trees and many other crops.

- Adults lay eggs in young leaf tissue, young branches or young fruits.

- Both adult  and larvae cause damage on young leaves and young fruits.

 

+ On young leaves, thrips cause leaves to become discolored and curled.

+On fruit, thrips produce gray patches or silvery protrusions on the peel.

- Fruits on the outside of the foliage are often more severely damaged.

- Thrips develop a lot in the dry and hot season.

c. Preventive measures:

- Collect damaged fruit and destroy.

- Spraying water on plants can limit the density of thrips.

- Thrips are very resistant to products, so alternate spraying with the following products: Secsaigon 50EC, Sairifos 585EC, Sago-super 20EC, Fenbis 25EC... should be combined with SK EnSpray 99EC mineral oil.

 

 

 

 

Same item

To prevent, in addition to plowing and burying weed seeds, collecting weed stalks and stumps left after tilling the land to burn, not letting weeds produce seeds in production fields, etc., the use of chemical products is still a measure. optimal because of its ability to thoroughly kill weeds, reduce labor and take advantage of more time than manual weeding.To prepare for the coming Summer-Autumn rice crop, we would like to introduce to you a very new product of Saigon Plant Protection Joint Stock Company, which is Butoxim 5GR. This is a granular product used for spreading by Saigon Plant Protection Joint Stock Company in research, production and distribution.

 

 Miner has the scientific name Phyllocnistis citrella Staint., family Phyllocnistidae, order Lepidoptera. The  miner occurs in many countries in the tropics and subtropics. The main host of the miner is the citrus family - Rutaceae. In addition, the miner also attacks mangosteen and some other plants.

 

Adult is a small planthopper, with a body 2-3 mm long, the whole body is ash gray, slightly greenish, the wings are opaque with many small brown spots.Eggs are oval, 0.3 mm long, have a pointed end and are attached directly to the leaf surface, leaf axils.Larvae are very small, oval in shape, newly hatched are bright yellow. Age 2 and age 3 are in green. Age 4 and age 5 are golden brown and 2 small wing sprouts.

 

Green bugs specialize in the fruit of citrus groups (oranges, tangerines, lemons, grapefruits, kumquats...), some people call them orange bugs, or orange suckers. Their scientific name is Rhynchocoris poseidon or Rhynchocoris humeralis.

 In Vietnam, yellow leaf curl disease is very common on papaya trees, especially the disease is often severe in areas of high and continuous planting, areas with hot and arid climates. The disease has significantly reduced the yield and quality of papaya. Gardens that are infected early when the plants are young may not yield. However, up to now, many gardeners still do not know the cause and how to fix it.

 

 Spider mites are common pests on citrus trees, especially in hot and dry climates that are suitable for spiders to grow and cause severe damage.The group of harmful spiders is usually very small in size, unlike the natural enemy spiders.Spiders have a very short life cycle, high reproductive ability, create many generations in a year, so it is easy to break out into epidemics in a short time.

 

 This group includes species that are generally very small in size, causing damage by sucking plant sap (on leaves, fruits, branches, stems).

There are many species of mealybugs present on the group of Oranges,Tangerines,Grapefruits and Lemons (Citrus), which can be divided into 2 groups:

+ Group of sticky mealybugs with common varieties such as Lepidosaphes, Aonidiella, Coccus and Saissetia.

+ Group of flower mealybugs with common genera and species such as Pseudococcus, Planococcus and Icerya purchasi.

Dry branches and berries disease often appear to be common damage on coffee gardens during the rainy season. The disease causes death of branchs, dry fruit, severely affects the canopy structure and coffee yield if not paid attention to prevention.

  

 Pink disease commonly causes diseases on rubber plantations in the rainy season, especially on garden from 4-8 years old. This year, rubber has to go through a period of severe drought, weakening the tree, so now in tnshe rainy season it is easy to get infected. Therefore, it is necessary to pay attention to good management to avoid affecting the garden.

Currently in Vietnam, the cultivation of citrus trees is playing an important role in the country agricultural production. The benefits of citrus trees have made many farmers rich. However, wherever citrus trees are planted, fissured trunk cracking appears and causes damage. If any gardener is negligent or lacks attention to this disease, the tree will die, even the whole garden.

  • Headquarters
  • SAIGON PLANT PROTECTION JOINT STOCK COMPANY
  • RQ 1, Nguyen Van Quy St., Tan Thuan Dong Ward, District 7, HCM City
  • Tax code: 0300632232
  • Tel: (028) 38 733 295 - 38 732 077
  • Fax: (028) 38 733 003 - 38 733 391
  • Website: www.spchcmc.vn - Email: info@spchcmc.vn
  • SAIGON PLANT PROTECTION COMPANY
  • SAIGON PLANT PROTECTION JOINT STOCK ENTERPRISE
  • Lot C1-C3 Hiep Phuoc Industrial Park, Hiep Phuoc Commune, Nha Be District, HCM City
  • Tel: (028) 3873 4089 - Fax: (028) 3873 4090
  • Affiliated Unit