<h1 class="pgc-h-arrow-right" > click on the top right corner of the article to pay attention to citrus ecological agriculture</h1>
Citrus rust tick is a more harmful mite, it is difficult to see with the naked eye, if you wait until the fruit surface "gray, hairy" has been too late. This year, due to the influence of El Niño, it is rainy in the early stage, and it is likely that the temperature will be higher in the later stage.
The harm rate of citrus producing areas with hotter climates is more than 50%, such as in southern Guangxi, rust ticks are seriously harmful, and there is no shortage of tragedies in these areas because of rust ticks causing black skin in entire orchards. Other people's orchards are harvested, and their own black peel fruits can only be sold at low prices, which is a pity.
Figure 1 Rust tick hazards
1. The occurrence of rust ticks
Generations overlap, and 18-30 generations can occur in a year. May began to climb the new shoots, after the end of June the density of insect population rapidly increased, July to September for the peak period, such as suitable temperature and humidity (average monthly temperature of 25 ~ 27 °C, relative humidity of 70% -80%), will be flooded, summer and autumn two seasons of harm is more serious.
This year's climate is affected by El Niño, there is a lot of rain in the early stage, and the temperature is likely to be high in the later stage, and the closest El Niño occurred in 2016, which was also the hottest year on Earth ever. When the temperature rises and the relative humidity is suitable, we must pay attention to prevent the outbreak of rust ticks.
Figure 2 Black peel fruit and its occurrence period
2. Characteristics of rusty ticks
Rust tick video
Rust ticks are also called rusty spiders, citrus rust mites and red spiders are relatives, but rusty spiders are much smaller than red spiders, invisible to the naked eye, and shaped like carrots.
Figure 3 Rust tick Source: 191 Agricultural resources
Sweet oranges are more serious, followed by oranges, the mouthparts pierce into the citrus fruit, stem, branches, leaves and other tissues will lead to oil cell rupture, aromatic oil overflow, after air oxidation of the leaf back and peel become black, the formation of oil lump fruit or commonly known as black peel fruit.
Fig. 4 Black skin of June young fruits
2. The reason why rust ticks are harmful
1, because the rust tick is too small, it is difficult to find with the naked eye, so if you do not pay attention to the inspection of the orchard, you will miss the best prevention time and cause the outbreak of rust mites.
Figure 5 Rust ticks under the microscope
2, rust ticks have explosive, can occur 18-30 generations a year, and the generations overlap, the density is very large.
Figure 6 Black peel fruit
3. The mouthpiece is special, the aromatic oil overflows after piercing into the tissue, and it becomes a black peel fruit after oxidation by air, which seriously affects the commerciality of the fruit.
Figure 7 Seriously injured fruits
4, high temperature and drought is conducive to the rapid increase of rust mite mouth, after may and june, the insect population began to increase rapidly, July to September is the peak of insect pests.
Figure 8 Leaf damage
3. The living habits of rusty ticks
Figure 9 Black peel fruit
Excellent control program recommended
At present, there are 12 formulas registered on rust ticks: 38 avermectin, 6 stone sulfur binders, 5 mineral oils, 4 phenoxybutyl tin, 4 chlorpyrifos, 4 cyanopter legos, 3 insecticides, 2 butyl thiocerbs, 2 pedicules, 2 azoles, 1 aviphenidine, 1 sulfluidine, a total of 72 products. Some unregistered prevention effects are also excellent, such as high-quality manganese zinc, spirosin in oviculides, etc.
Recommended Formula:
As budweiser butylthio is gradually banned, safer ingredients such as lice and urea will be gradually replaced, and safer ingredients are also recommended for fruit safety.
Formula 1: High quality Daisen manganese zinc 600-800 times 20% butyl sulfur Budweiser emulsion 1000-1500 times.
Formula 2: 5% avermectin 1500 times + 5% lice mite urea 1500 times, insecticidal and egg killing, with a duration of about 20 days (recommended)
Formula 3: 1.8% avermectin 1500 times 15% zoloftamide 2000 times
Formula 4: 1.8% avermectin 1500 times 15% pyridoxine or azole mite 1500 times (can achieve rapid action but the duration of efficacy is not long, about 7 days).
Source: Great Harvest Citrus Plant Protection Orange Sister