Papaya [Carica papaya] plants or trees may be categorized to male, female or hermaphrodite trees based on type of flowers they produce. As indicated above depending on the tree's type or gender, the flowers and fruit (if found) vary in appearance, function and size. Typically, a papaya plant’s gender may change depending on the temperature during the developmental stages.
Causes of Flower Drop
1. Temperature and relative humidity [RH] the environmental temperature and RH especially micro climate near and around flowers must be in range of 200C to 330C and 70 % to 85 % respectively. Lesser and higher than the range affects the pollination, fertilization of papaya fruits and flowers may drop off with forming to the fruit.
Chemical growth regulators can sometimes help overcome low temperature effect but the fruit developed will be seedless or may be of poor quality.
2. Cultural - lack or excess of nitrogen [N] fertility. Low and high dose of nitrogen may cause flower drop. The toxicity may be the direct effect for flower abortion. Ammoniacal nitrogen at even medium level has got indirect effect on flower setting and fruit setting.
Indirectly ammoniacal nitrogen triggers the regular viral infections which may also result in flower dropping. Manganese micro-nutrient spray on high nitrogen doses may manage viral infections on papaya plants.
3. Lack of water and excessive moisture may affect the flower development, pollination, fertilization and fruit setting. Uneven water supply to the papaya plants/ trees induces stress leading to uneven flowering and fruit setting.
4. Reduced or extended light exposure has adverse effect and may affect the flower development, pollination, fertilization and fruit setting.
5. Excessive wind naturally causes physical damage and pollens to swipe off leading to poor pollination and fertilization.
6. Insect damage particularly by the flower feeders, fruit feeders and probably by chewing type insects will affect the flower health.
7.Foliar diseases Fungal infections like Powdery mildew, Downy mildew, Black spot; bacterial infections like bacterial spot, speck disease and viral infections like Papaya Ring spot infections, Curl leaf viral infections
8. Nutrient deficiency especially with micronutrients like Boron and Calcium in case of sandy and light soils with poor water and nutrient holding capacities.
The controllable things possible practically, the disease and pest management may be monitored for avoiding the flower drop and get maximum yield. Proper balanced nutrient management may also help to get good flower health and better fruit setting in papaya crop.
Sprays to prevent flower dropping in Papaya crop
Check out for moisture in soil and atmosphere; temperature extremities and also go for the following sprays to keep away the diseases [Powdery, Downy, Spot diseases, Bacterial diseases..etc] and also supplement the required nutrients for proper flower and fruit setting.
Above sprays may be sprayed for the control of flower dropping or abortion. The combinations will control sucking pests like thrips, aphids; powdery, downy mildew and other fungal & Bacterial diseases; also supplement some essential nutrients for better flower initiation and fruit setting and avoid flower or fruit droppings.
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