It is a typical pest of stone fruit trees, however when insecticide treatments are reduced, sometimes as a consequence of the use of the sexual confusion method for the control of carpocapsa, it can cause problems in the pip fruit trees. The adult is a butterfly about 10-15 mm in wingspan whose front wings are very dark or black, the hind wings are grayish brown more pale than the front. The eggs are very small, oval, flattened, first translucent white and then yellowish as they approach maturation. The caterpillars, whitish at the beginning, grow as they get the pink tone that characterizes them, the head is pale brown and have an anal comb that can clearly differentiate from the larvae of carpocalypse. At the end of their development they reach a length of 15 mm.
Winter spends as a mature larva in the rugosities of the trunk or on the ground. In March begins the crisalidación and at the end of the same month appear the first adults. The setting is only carried out when the temperature in the twilight exceeds 16 ° C, the eggs deposited in isolation on the underside of the leaves, the young shoots or next to the fruits, take to eclosar between 5 and 10 days depending on the temperatures. It has been observed that if during the 10-12 days following the start of oviposition the thermal level (sum of (mean temperature -10)) does not exceed 90 ° C, the egg dies, significantly reducing the risk of damage and therefore the importance of the initial population of the year. The larva penetrates quickly in the shoots and digs a descending gallery until finding the lignified zone, moment in which it leaves to the outside and it is introduced in another bud, being able the same larva to destroy between 2 and 4 buds. The larval development is completed between 2 and 3 weeks. At the end of May, the adults of the second generation emerge and from this the flights of the three remaining generations overlap, capturing adults until the end of October. The adults of summer make the placing preferably on the fruits and the eggs hatch in only 3 days penetrating quickly the fruit in the direction of the seeds.
Symptoms and damage of Oriental moth or Grafolita Annoyance of pip fruit, Cydia molesta
The damage caused by the larva in growing shoots is almost never economically important.
After the attack, an incipient wilting of the shoot is observed, which reacts by developing the lateral buds of its tip.
In apple and pear trees these first generation attacks do not usually translate into attacks on the fruits, however in the remaining generations damage to the fruits can be observed without the buds of the same tree being affected.
It can attack any part of the fruit but has a certain preference for the peduncular area and kallikin. With high temperatures the attack is very fast and can damage a considerable number of fruits in less than a week.
Critical period for cultivation
From June until the harvest with a maximum of susceptibility during the month of August.
Monitoring and estimation of the risk for the crop
Traps baited with sex pheromones as attractants can be used for the detection and monitoring of populations. Also the observation of 200 fruits will give information about the evolution of the pest and the critical moments.
Threshold / Moment of intervention
The treatments will be justified when one of the following thresholds is exceeded: 1% of damaged fruits 20 catches per trap per week.