Agriculture is very important to provide the needs of humans. For effective and economical Crop production require the knowledge on different aspects agriculture such as pest and diseases and agronomic practices.The aim of this site is to provide information related to common problems associated with agriculture crop production.Information of plant diseases and pest and their control are found here.
Tuesday, March 20, 2012
Control of leaf curl complex of pepper(Capsicum spp.)
Leaf curl complex of pepper(Capsicum spp.)
Virus infection, sucking of mites, aphides and thrips are the main reasons for leaf curl situation of pepper. If conditions are favorable all three factors create leaf curl complex of pepper.
White fly/Virus: Virus that makes leaf curl disease is transmitted by the while fly (Bemicia tabaci).Leaves become yellow and boat shaped, veins prominent and plant become stunted.
Virus infected plants
Mites: Hemitarsonemus latus
Mites are oval shaped, brown in color and unable to see with naked eye.
Mites are on underside of leaves and Suck leaves so that leaves rolled down side.
Leaves rolled downward
Aphis gossypii-1-2 mm, black color
Myzus persicae- 1.25-2.5mm, yellowish green color.
Suck leaves and stems. Leaves become cup shaped. Secretion of aphides makes fungi to grow on leaves and leaves become black color.
Scirtothrips dorsalis -1 mm long brown in color, adult and nymphs suck the young leaves and young stems. Leaves rolled up words and drop when damage is serious. White streaks can be seen in fruits when damage fruits and fruits malformed .Thrips pupate in the soil. Life span is about 14 to 30 days depending on the environmental factors when conditions are dry life cycle is completed in short period.
Leaves rolled upward
Conditions affect the situation
1Over use of insecticides that are not recommended to control the situation destroy natural enemies of pests.
2Higher nitrogen application makes plant susceptible to pests.
3High temperature and dry condition.
4When different stages of crop are found in adjacent areas it is difficult to control the disease situation.
2Crop sanitation –remove crop debris and weeds.
3Use healthy seed and seedlings.
4Spray during dry season –reduces pest population.
5Mulching reduces thirps population as they pupate in soil.
6Use yellow polythene smeared with grease to trap pest.
Chemicals that control thrips, mites and white fly are used to control the leaf curl situation of pepper.
Imidachlopid, Lufenuron ,Carbosulfan, Fipronil, Phosalone, Prothiofos can be used to control the pests.
When mite damage is present Sulphur ,Abamectin, Hexithiozox, Flufenooxyzon can be used .