Citrus fruit scars are a major cause of the appearance quality of fruit. According to the survey, the mature citrus fruit is only 3 to 5% of the total number without scars. Under the guidance of Huazhong Agricultural University, in 2008, we focused on systematic observation of citrus fruit surface damage. In the Baihe Citrus Base in Wangdian Town, the citrus-producing area of ​​the city, observation sites were set up in the citrus base of Fenghuang Mountain in Banyue Township. A number of primary sources were obtained by adopting methods of timing, setting, and observation. After a meta-analysis, the cause and period of the occurrence of citrus fruit scars were initially found.
First, the main reasons for the production of citrus fruit scars
Causes of citrus fruit surface scars can be roughly divided into four categories: 1 Insect pests. The young fruit period mainly includes beetles, thrips, and appendages, etc.; the mature stage is mainly leafhoppers. 2 diseases. The young fruit period is mainly scab disease, gray mold; fruit enlargement period of the skin disease. 3 drug damage, all year round. 4 mechanical damage, including wind damage, hail damage, and human injury.
Causes and periods of citrus fruit scars
Damage type
Young fruit
(April-May)※
Expansion period
(June-August)
Mature period
(September-November) ※
Pests
Beetle ※ ※, hummer, line 螨
Ye Hao ※※
Disease
Scab disease ※, gray mold
Spiosis
Phytotoxicity
Prone to happen
Prone to happen
Mechanical damage
Prone to happen
※ is the main reason and period of occurrence
Although the cause of the citrus fruit surface scars is complex, as long as we take control of key targets during the key period, we can achieve very good results. In flowering and young fruit period, it is mainly used to control beetles, thrips, line worms and scabs; in the mature stage, it is mainly used to control leaf lice.
Second, control methods
According to the causes and times of fruit surface injury, in 2009, we will formulate corresponding preventive measures to reduce the occurrence of fruit surface scars and improve the appearance quality of citrus.
1, frequency vibration type insecticidal lamp trapping frequency vibration type insecticidal lamp on the beetle, leafhopper has a good trapping effect. From the middle and late April-June, the sepia was trapped in the citrus orchard with a frequency-vibrant insecticidal lamp. In September-November, it was seized and killed.
2. Drug control Sprayed with 2000 times Nisolon in mid-April, focusing on prevention and control of multi-feeding cockroaches and spider mites; 90% spraying in late April (before full bloom) and early May (after full bloom) The crystal trichlorphon of 1000 times + 70% thiophanate-methyl 1000 times is used to control chafer, thrips and scab.
4, the safe use of drugs is not medication in hot weather, do not arbitrarily increase the dose, do not mix drugs, mixed drugs generally do not exceed two kinds, so as to avoid fruit damage. (Hubei Dangyang agriculture 110 Zhu Liqing)
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