Some time ago traveled to Guangzhou, the author found that zengcheng district here has a lot of area of guava, these guava is in the ripening period, the author visited and found that many orchards have abnormal fruit fall, and finally after investigation found that the cause of the abnormal fruit fall phenomenon of guava is caused by a small "needle bee" hazard.
Why is the little guava needle bee so harmful? In fact, the guava needle bee is also known as the fruit fly is a kind of fly eater, which in addition to harming guava can also harm bitter melon, water melon, loofah and other melon fruit crops; guava needle bee mainly occurs more seriously when the guava enters the ripening stage, this is because the guava ripens its peel will be softer and more conducive to adult insects using the egg layer to easily break the peel to lay eggs, adults successfully lay eggs in the guava, after a period of time the eggs will hatch into larvae, and the larva will feed on the flesh of the guava. That is, "eating, drinking, and sleeping" inside the guava fruit will eventually decay the inside of the fruit and cause the infection of germs, resulting in the phenomenon of rotting and browning and stinking in the fruit, and eventually causing serious losses due to abnormal fall.
<h1 class= "pgc-h-arrow-right" >why is the guava needle bee every year? </h1>
1, guava needle bee adult can fly and escape
Guava needle bee adults with wings have the ability to fly so can carry out the transfer hazard, when a farmer in a certain field sprays chemicals in the orchard, after being frightened, they will fly away and flee to the nearby surrounding orchards for feeding hazards, and then will fly back to continue to harm so repeatedly, if farmers can not carry out unified drug prevention then there will be needle bees more and more serious harm and always feel that the phenomenon of never finishing.
2, guava needle bee food source is rich
As mentioned earlier, the eating habits of guava needle bees are more mixed, in addition to harming guava, citrus, persimmon and other fruit trees, it can also harm bitter melon, winter melon, loofah and other crops, and the author visited and found that there are a large number of loofahs, fruits, melons and other melon crops planted near the guava garden in Zengcheng District, which undoubtedly improves the sufficient source of food for guava needle bees, so that they can go back and forth, repeatedly between different crops, transfer hazards, thereby increasing the difficulty of prevention and control.
3. Farmers rely too much on chemicals for prevention and control
The author visited and investigated and found that in the prevention and control of guava needle bees, many fruit farmers still rely too much on chemical control, they often think that after playing a drug to see the death of adult poisoning, they have prevented needle bees, but they do not know that although their own orchards temporarily prevent needle bees, the needle bees in the surrounding fields behind them still fly to endanger their own guavas, which eventually leads to a serious reduction in production of guavas.
<h1 class= "pgc-h-arrow-right" > how to effectively control guava needle bees? That is, the integrated control measures of the guava needle bee</h1>
1. Keep a clean and tidy environment to reduce the insect source base in the orchard
Guava needle bees like to eat on the sweet and sour taste of rotten matter, when the field sporadic because of anthrax or needle bees caused by abnormal fall of rotten fruit, guava needle bees will fly to feed and lay eggs, so that the fallen fruit on the ground will have more eggs and larvae, if not removed in time to remove these rotten fruits in time outside the orchard landfill or burn will increase the number of insect mouth base in the field, so the fruit farmers should remove the rotten fruits and weeds dropped in the orchard in time. Maintaining a relatively clean field environment can reduce the occurrence of needle bees.
2. Strengthen green prevention and control measures to reduce the harm of fruits
· Yellow plate booby trap: When the guava fruit enters the expansion to maturity stage, farmers can use the commercially available fruit fly physical binder spray with sugar, vinegar flavor, attracting agent and adhesive on the yellow board, and place 10-15 sheets per acre, which can effectively trap the adult guava needle bee and reduce the insect population base in the orchard.
· Fruit bagging: When the field guava young fruit grows to the size of an egg and begins to sag, the growers can use high-efficiency insecticide fungicides to spray the orchard evenly once for disinfection treatment, and after the potion is dried, they can choose to use a double-layer polypropylene material with a suitable thickness of white transparent film bags to bag the guava fruit, it should be noted that the guava tree should be reasonably thinned before bagging, which can both increase yield and reduce the feed of needle bees.
3. Use high-efficiency insecticides for auxiliary control
For the control of guava needle bee, fruit farmers can not rely too much on chemical agents, because the simple use of chemicals for prevention and control is not long-term, on the basis of the above control measures, the flexible use of chemical agents for control aids is the best comprehensive control measures.
When a small number of adult insects begin to appear in the field, farmers can use chemical agents for control, which can choose a type of chemical agent with a long shelf life of microcapsulate suspension, such as 5% high-efficiency cystectothrin microcapsulant suspension 1000 times, 30% Kung Fu · thiamethoxam microcapsulant suspension 1500-2000 times, etc. spray the whole park, using the microcapsule suspension technology slow release function, the guava needle bee has a secondary touch killing effect and play a longer preventive effect.
In general, the harm of guava needle bees to guava is immeasurable and can not be ignored, fruit farmers should do a good job in agricultural basic prevention and control, strengthen green prevention and control measures and then light chemicals to assist in prevention, so as to more effectively reduce the harm of needle bees.